diff --git a/README.md b/README.md
index e04da1f..84b2df9 100755
--- a/README.md
+++ b/README.md
@@ -3,3 +3,17 @@ Welcome to the 3rd Mock Machine Coding Round by [workat.tech](http://workat.tech
 
 Please visit [this link](https://workat.tech/machine-coding/practice/trello-problem-t0nwwqt61buz) to participate.
 
+NOTE: 
+1. Currently the unique id isn't based on hash, but a counter that gets appended to type of element being creaated.
+2. The output is just printing stuff line after line, instead of in a dict. I'll try to change that later.
+3. I've added some of my own methods, like SHOW USER, CREATE USER, etc. 
+4. Sample input is present in sample_input.txt 
+
+TO RUN:
+
+$> g++ user.cpp card.cpp list.cpp board.cpp appManager.cpp driver.cpp -o trello
+
+$> ./trello
+
+TODO:
+Cmake command
diff --git a/appManager.cpp b/appManager.cpp
new file mode 100644
index 0000000..35ac801
--- /dev/null
+++ b/appManager.cpp
@@ -0,0 +1,198 @@
+#include <bits/stdc++.h>
+#include "appManager.h"
+#include "board.h"
+#include "list.h"
+#include "card.h"
+#include "user.h"
+
+using namespace std;
+
+AppManager::AppManager(){
+    board = 0;
+    card = 0;
+    list = 0;
+    user = 0;
+}
+
+void AppManager::show(){
+    if(boards.size()==0){
+        cout << "No Board" << endl;
+        return;
+    }
+    for(map<string,Board*>::iterator it=boards.begin(); it!=boards.end(); it++)
+        (it->second)->printBoard();
+}
+
+void AppManager::showBoard(string boardId){
+    if(boards.find(boardId)==boards.end())
+        cout << "Board " << boardId << " doesn't exist!" << endl;
+    else 
+        boards[boardId]->printBoard();
+    
+}
+
+void AppManager::showList(string listId){
+    if(lists.find(listId)==lists.end())
+        cout << "List " << listId << " doesn't exist!" << endl;
+    else 
+        lists[listId]->printList();
+}
+
+void AppManager::showCard(string cardId){
+    if(cards.find(cardId)==cards.end())
+        cout << "Card " << cardId << " doesn't exist!" << endl;
+    else
+        cards[cardId]->printCard();
+}
+
+void AppManager::showUserCards(string userId){
+    if(users.find(userId)==users.end())
+        cout << "User " << userId << " doesn't exist!" << endl;
+    else
+        users[userId]->myCards();
+}
+
+void AppManager::createBoard(string name){
+    board++;
+    string id = "Board" + to_string(board);
+    Board* b = new Board(name, id);
+    boards[id] = b;
+    return;
+}
+void AppManager::removeBoard(string id){
+    if(boards.find(id)==boards.end())
+        cout << "Board " << id << " doesn't exist!" << endl;
+    else {
+        cout << "Deleting Board" << endl;
+        Board* b = boards[id];
+        set<List*> listSet = b->getLists();
+        while(begin(listSet) != end(listSet)){
+            set<List*>::iterator it_list = listSet.begin();
+            set<Card*> cardSet = (*it_list)->getCards();
+            while(begin(cardSet)!=end(cardSet)){
+                set<Card*>::iterator it_card = cardSet.begin();
+                cards.erase((*it_card)->getId());
+                delete *it_card;
+            }
+            lists.erase((*it_list)->getId());
+            delete *it_list;
+        }
+        boards.erase(id);
+        delete(b);
+    }
+    return;
+}
+
+void AppManager::addMemberToBoard(string boardId, string memberId){
+    if(boards.find(boardId)==boards.end())
+        cout << "Board " << boardId << " doesn't exist!" << endl;
+    else if(users.find(memberId)==users.end())
+        cout << "User " << memberId << " doesn't exist!" << endl; 
+    else
+        (boards[boardId])->addMember(users[memberId]);
+    return;
+}
+
+void AppManager::removeMemberFromBoard(string boardId, string memberId){
+    if(boards.find(boardId)==boards.end())
+        cout << "Board " << boardId << " doesn't exist!" << endl;
+    else if(users.find(memberId)==users.end())
+        cout << "User " << memberId << " doesn't exist!" << endl; 
+    else
+        (boards[boardId])->removeMember(users[memberId]);
+    return;
+}
+
+void AppManager::updateBoardName(string boardId, string newName){
+    if(boards.find(boardId)==boards.end())
+        cout << "Board " << boardId << " doesn't exist!" << endl;
+    else
+        (boards[boardId])->setName(newName);
+}
+void AppManager::updateBoardPrivacy(string boardId, string newPrivacy){
+    if(boards.find(boardId)==boards.end())
+        cout << "Board " << boardId << " doesn't exist!" << endl;
+    else
+        (boards[boardId])->setPrivacy(newPrivacy);
+}
+
+void AppManager::createList(string boardId, string listName){
+    if(boards.find(boardId)==boards.end())
+        cout << "Board " << boardId << " doesn't exist!" << endl;
+    else {
+        list++;
+        string id = "List" + to_string(list);
+        List* list = new List(listName, id, boards[boardId]);
+        lists[id] = list;
+    }
+}
+
+void AppManager::removeList(string listId){
+    if(lists.find(listId) == lists.end())
+        cout << "List " << listId << " doesn't exist!" << endl;
+    else {
+        cout << "Deleting list" << endl;
+        List* l = lists[listId];
+        set<Card*> cardSet = l->getCards();
+        while(begin(cardSet)!=end(cardSet)){
+            set<Card*>::iterator it_card = cardSet.begin();
+            cards.erase((*it_card)->getId());
+            delete *it_card;
+        }
+        l->deleteFromParentBoard();
+        lists.erase(listId);
+        delete(l);
+    }
+}
+
+void AppManager::createCard(string listId, string cardName){
+    if(lists.find(listId) == lists.end())
+        cout << "List " << listId << " doesn't exist!" << endl;
+    else {
+        card++;
+        string id = "Card" + to_string(card);
+        Card* c = new Card(cardName, id, lists[listId]);
+        cards[id] = c;
+    }
+}
+
+void AppManager::removeCard(string cardId){
+    if(cards.find(cardId)==cards.end())  
+        cout << "Card " << cardId << " doesn't exist!" << endl;
+    else {
+        Card* c = cards[cardId];
+        c->deleteThisCard();
+        cards.erase(cardId);
+        delete(c);
+    } 
+}
+
+void AppManager::assignCard(string cardId, string memberId){
+    if(cards.find(cardId)==cards.end())
+        cout << "Card " << cardId << " doesn't exist!" << endl;
+    else if(users.find(memberId)==users.end())
+        cout << "User " << memberId << " doesn't exist!" << endl;
+    else 
+        cards[cardId]->assignTo(users[memberId]);
+}
+
+void AppManager::updateCardName(string cardId, string newName){
+    if(cards.find(cardId)==cards.end())
+        cout << "Card " << cardId << " doesn't exist!" << endl;
+    else
+        cards[cardId]->setName(newName);
+}
+
+void AppManager::updateDescription(string cardId, string description){
+    if(cards.find(cardId)==cards.end())
+        cout << "Card " << cardId << " doesn't exist!" << endl;
+    else
+        cards[cardId]->setDescription(description);
+}
+
+void AppManager::createMember(string name, string email){
+    user++;
+    string id = "User" + to_string(user);
+    User* user = new User(name, email, id);
+    users[id] = user;
+}
\ No newline at end of file
diff --git a/appManager.h b/appManager.h
new file mode 100644
index 0000000..b091a75
--- /dev/null
+++ b/appManager.h
@@ -0,0 +1,45 @@
+#ifndef APPMANAGER_H
+#define APPMANAGER_H
+#include <bits/stdc++.h>
+
+using namespace std;
+
+class Board;
+class List;
+class Card;
+class User;
+
+class AppManager {
+    map<string, Board*> boards;
+    map<string, List*> lists;
+    map<string, Card*> cards;
+    map<string, User*> users;
+    int board, list, card, user;
+    public:
+        AppManager();
+        void show();
+        void showBoard(string id);
+        void showList(string id);
+        void showCard(string id);
+        void showUserCards(string id);
+
+        void createBoard(string name);
+        void removeBoard(string id);
+        void addMemberToBoard(string boardId, string memberId);
+        void removeMemberFromBoard(string boardId, string memberId);
+        void updateBoardName(string boardId, string newName);
+        void updateBoardPrivacy(string boardId, string newPrivacy);
+
+        void createList(string boardId, string listName);
+        void removeList(string id);
+
+        void createCard(string listId, string cardName);
+        void removeCard(string id);
+        void assignCard(string cardId, string memberId);
+        void updateCardName(string cardId, string newName);
+        void updateDescription(string cardId, string description);
+
+        void createMember(string name, string email);
+};
+
+#endif
\ No newline at end of file
diff --git a/board.cpp b/board.cpp
new file mode 100644
index 0000000..a7271d0
--- /dev/null
+++ b/board.cpp
@@ -0,0 +1,65 @@
+#include <bits/stdc++.h>
+#include "board.h"
+#include "list.h"
+#include "user.h"
+
+using namespace std;
+
+Board::Board(string name, string id){
+    this->name = name;
+    this->id = id;
+    this->privacy = "PUBLIC";
+    cout << "Board created with name:" << name << " id:" << id << " and privacy:" << privacy << endl;
+}
+
+void Board::printBoard(){
+    cout << "BOARD name:" << name << " id:" << id << " privacy:" << privacy << endl;
+    cout << "*** Members ***" << endl;
+    for(set<User*>::iterator it=members.begin(); it!=members.end(); it++)
+        (*it)->printUser();
+    for(set<List*>::iterator it=lists.begin(); it!=lists.end(); it++){
+        cout << "*** Lists ***" << endl;
+        (*it)->printList();
+    }
+    cout << endl;
+}
+
+void Board::setName(string newName){
+    name = newName;
+}
+
+void Board::setPrivacy(string newPrivacy){
+    privacy = newPrivacy;
+}
+
+void Board::addMember(User* member){
+    members.insert(member);
+    cout << "Added member " << member->getName() << " to Board " << name << endl;
+}
+
+void Board::removeMember(User* member){
+    if (members.find(member)==members.end())
+        cout << "User " << member->getName() << " isn't a part of Board " << name << endl;
+    else
+        members.erase(member);
+}
+
+void Board::addList(List* list){
+    lists.insert(list);
+    cout << "Added list " << list->getName() << " to Board " << name << endl;
+}
+
+void Board::removeList(List* list){
+    if (lists.find(list)==lists.end())
+        cout << "List " << list->getName() << " isn't a part of Board " << name << endl;
+    else
+        lists.erase(list);
+}
+
+set<List*> Board::getLists(){
+    return lists;
+}
+
+string Board::getName(){
+    return name;
+}
\ No newline at end of file
diff --git a/board.h b/board.h
new file mode 100644
index 0000000..20fb60c
--- /dev/null
+++ b/board.h
@@ -0,0 +1,26 @@
+#ifndef BOARD_H
+#define BOARD_H
+#include <bits/stdc++.h>
+
+using namespace std;
+
+class List;
+class User;
+
+class Board {
+    string id, name, privacy;
+    set<User*> members;
+    set<List*> lists;
+    public:
+        Board(string name, string id);
+        void printBoard();
+        void setName(string name);
+        void setPrivacy(string privacy);
+        void addMember(User* member);
+        void removeMember(User* member);
+        void addList(List* list);
+        void removeList(List* list);
+        set<List*> getLists();
+        string getName();
+};
+#endif
\ No newline at end of file
diff --git a/card.cpp b/card.cpp
new file mode 100644
index 0000000..15a62e9
--- /dev/null
+++ b/card.cpp
@@ -0,0 +1,48 @@
+#include <bits/stdc++.h>
+#include "card.h"
+#include "list.h"
+#include "user.h"
+
+using namespace std;
+
+Card::Card(string name, string id, List* parentList){
+    this->name = name;
+    this->id = id;
+    assignedTo = nullptr;
+    this->parentList = parentList;
+    parentList->addCard(this);
+    cout << "Card created with name:" << name << " id:" << id << " parentList:" << parentList->getName() << endl;
+}
+
+void Card::printCard(){
+    cout << "CARD name:" << name << " id:" << id << " assignedTo:" << ((assignedTo==nullptr)?"None":assignedTo->getName()) << " description:" << description << endl;
+}
+
+void Card::assignTo(User* user){
+    //apply check whether user is a part of this board or not.
+    assignedTo = user;
+    user->addCard(this);
+}
+
+void Card::deleteThisCard(){
+    parentList->removeCard(this);
+    if(assignedTo){
+        assignedTo->unassignCard(this);
+    }
+}
+
+string Card::getId(){
+    return id;
+}
+
+string Card::getName(){
+    return name;
+}
+
+void Card::setName(string newName){
+    name = newName;
+}
+
+void Card::setDescription(string newDescription){
+    description = newDescription;
+}
\ No newline at end of file
diff --git a/card.h b/card.h
new file mode 100644
index 0000000..82683c2
--- /dev/null
+++ b/card.h
@@ -0,0 +1,26 @@
+#ifndef CARD_H
+#define CARD_H
+
+#include <bits/stdc++.h>
+
+using namespace std;
+
+class List;
+class User;
+
+class Card {
+    string id, name, description;
+    User* assignedTo;
+    List* parentList;
+    public:
+        Card(string name, string id, List* parentList);
+        void printCard();
+        void assignTo(User* user);
+        void deleteThisCard();
+        string getId();
+        string getName();
+        void setName(string newName);
+        void setDescription(string newDesciption);
+};
+
+#endif
\ No newline at end of file
diff --git a/driver.cpp b/driver.cpp
new file mode 100644
index 0000000..aea0529
--- /dev/null
+++ b/driver.cpp
@@ -0,0 +1,71 @@
+#include <bits/stdc++.h>
+#include "appManager.h"
+#include "board.h"
+#include "list.h"
+#include "card.h"
+#include "user.h"
+#include "utils.h"
+
+using namespace std;
+
+int main(){
+    AppManager* appManager = new AppManager();
+    // appManager->createMember("Emilia", "ec@gmail.com");
+    // appManager->createMenber("Keilah", "kk@gmail.com");
+    // appManager->createMember("Jennifer", "ja@gmail.com");
+    // appManager->createMember("Mikaela", "m@gmail.com");
+    string input;
+    while(getline(cin, input)){
+        if(input=="")
+            break;
+        vector<string> args = tokenize(input, ' ');
+        if(args[0]=="SHOW"){
+            if(args.size()==1)
+                appManager->show();
+            else if(args[1]=="BOARD")
+                appManager->showBoard(args[2]); //id
+            else if(args[1]=="LIST")
+                appManager->showList(args[2]); //id
+            else if(args[1]=="CARD")
+                appManager->showCard(args[2]); //id
+            else if(args[1]=="USER")
+                appManager->showUserCards(args[2]);  //id
+        } else if(args[0]=="BOARD"){
+            if(args[1]=="CREATE")
+                appManager->createBoard(args[2]); //name
+            else if(args[1]=="REMOVE")
+                appManager->removeBoard(args[2]); //id
+            else if(args[2]=="ADD_MEMBER")
+                appManager->addMemberToBoard(args[1], args[3]); //boardId, memberId
+            else if(args[2]=="REMOVE_MEMBER")
+                appManager->removeMemberFromBoard(args[1], args[3]); //boardId, memberId
+            else if(args[2]=="NAME")
+                appManager->updateBoardName(args[1], args[3]); //boardId, newName
+            else if(args[2]=="PRIVACY")
+                appManager->updateBoardPrivacy(args[1], args[3]); //boardId, privacy
+        } else if(args[0]=="LIST"){
+            if(args[1]=="CREATE")
+                appManager->createList(args[2], args[3]); //boardId, listName
+            else if(args[1]=="REMOVE")
+                appManager->removeList(args[2]); //listId
+        } else if(args[0]=="CARD"){
+            if(args[1]=="CREATE")
+                appManager->createCard(args[2], args[3]); //listId, cardName
+            else if(args[1]=="REMOVE")
+                appManager->removeCard(args[2]); //cardId
+            else if(args[2]=="ASSIGN")
+                appManager->assignCard(args[1], args[3]); //cardId, memberId
+            else if(args[2]=="NAME")
+                appManager->updateCardName(args[1], args[3]); //cardId, newName
+            else if(args[2]=="DESCRIPTION"){
+                string description = "";
+                for(int i=3; i<args.size(); i++)
+                    description += args[i] + " ";
+                appManager->updateDescription(args[1], description); //cardId, description
+            }
+        } else if(args[0]=="USER"){
+            //args[1] is always CREATE
+            appManager->createMember(args[2], args[3]); //name, email
+        }
+    }
+}
\ No newline at end of file
diff --git a/list.cpp b/list.cpp
new file mode 100644
index 0000000..e099836
--- /dev/null
+++ b/list.cpp
@@ -0,0 +1,48 @@
+#include <bits/stdc++.h>
+#include "list.h"
+#include "board.h"
+#include "card.h"
+
+using namespace std;
+
+List::List(string name, string id, Board* parentBoard){
+    this->name = name;
+    this->id = id;
+    this->parentBoard = parentBoard;
+    parentBoard->addList(this);
+    cout << "List created with name:" << name << " id:" << id << " parentBoard:" << parentBoard->getName() << endl;
+}
+
+void List::printList(){
+    cout << "LIST name:" << name << " id:" << id << endl;
+    cout << "*** CARDS ***" << endl;
+    for(set<Card*>::iterator it=cards.begin(); it!=cards.end(); it++)
+        (*it)->printCard();
+}
+
+void List::addCard(Card* card){
+    cards.insert(card);
+}
+
+void List::removeCard(Card* card){
+    if (cards.find(card)==cards.end())
+        cout << "Card " << card->getName() << " isn't a part of List " << name << endl;
+    else
+        cards.erase(card);
+}
+
+void List::deleteFromParentBoard(){
+    parentBoard->removeList(this);
+}
+
+set<Card*> List::getCards(){
+    return cards;
+}
+
+string List::getId(){
+    return id;
+}
+
+string List::getName(){
+    return name;
+}
\ No newline at end of file
diff --git a/list.h b/list.h
new file mode 100644
index 0000000..9f4352b
--- /dev/null
+++ b/list.h
@@ -0,0 +1,26 @@
+#ifndef LIST_H
+#define LIST_H
+
+#include <bits/stdc++.h>
+
+using namespace std;
+
+class Board;
+class Card;
+
+class List {
+    string id, name;
+    Board* parentBoard;
+    set<Card*> cards;
+    public:
+        List(string name, string id, Board* parentBoard);
+        void printList();
+        void addCard(Card* card);
+        void removeCard(Card* card);
+        void deleteFromParentBoard();
+        set<Card*> getCards();
+        string getId();
+        string getName();
+};
+
+#endif
\ No newline at end of file
diff --git a/sample_input.txt b/sample_input.txt
new file mode 100644
index 0000000..79290ce
--- /dev/null
+++ b/sample_input.txt
@@ -0,0 +1,53 @@
+SHOW
+USER CREATE emilia ec@gmail.com
+USER CREATE keilah kk@gmail.com
+USER CREATE jennifer ja@gmail.com
+USER CREATE mikaela m@gmail.com
+SHOW
+SHOW USER user1
+SHOW USER User1
+BOARD CREATE first_board
+SHOW BOARD Board1
+BOARD Board1 NAME myBoard
+SHOW
+BOARD Board1 ADD_MEMBER User1
+BOARD Board1 ADD_MEMBER User2
+SHOW BOARD Board1
+BOARD CREATE secondBoard
+BOARD Board2 ADD_MEMBER User3
+BOARD Board2 ADD_MEMBER User4
+BOARD Board2 ADD_MEMBER User1
+BOARD Board2 REMOVE_MEMBER User4
+BOARD Board2 PRIVACY private
+SHOW
+LIST CREATE Board1 B1L1
+LIST CREATE Board1 B1L2
+SHOW BOARD Board1
+LIST REMOVE List1
+SHOW LIST List1
+SHOW LIST List2
+SHOW
+LIST CREATE Board2 B2L1
+CARD CREATE List3 L3C1
+CARD CREATE List2 L2C1
+CARD CREATE List1 L1C1
+CARD CREATE List2 L2C2
+LIST CREATE Board1 B1L3
+CARD CREATE List4 L4C1
+SHOW LIST List2
+SHOW
+SHOW LIST List1
+CARD Card2 ASSIGN User1
+CARD Card3 ASSIGN User2
+CARD Card1 DESCRIPTION this card is in list 1 of board 2
+SHOW CARD Card1
+SHOW LIST List2
+CARD Card2 NAME newCardName
+SHOW CARD Card2
+SHOW
+CARD Card4 ASSIGN User1
+SHOW USER User1
+SHOW USER User2
+CARD REMOVE Card4
+SHOW
+SHOW USER User1
diff --git a/user.cpp b/user.cpp
new file mode 100644
index 0000000..a70ae37
--- /dev/null
+++ b/user.cpp
@@ -0,0 +1,38 @@
+#include <bits/stdc++.h>
+#include "card.h"
+#include "user.h"
+
+using namespace std;
+
+User::User(string name, string email, string id){
+    this->name = name;
+    this->email = email;
+    this->id = id;
+    cout << "User created with name:" << name << " id:" << id << " email:" << email << endl;
+}
+
+void User::myCards(){
+    cout << "User " << name << " has following cards assigned:" << endl;
+    for(set<Card*>::iterator it=cardsAssigned.begin(); it!=cardsAssigned.end(); it++)
+        (*it)->printCard();
+}
+
+void User::printUser(){
+    cout << "User name:" << name << " id:" << id << " email:" << email << endl;
+}
+
+void User::addCard(Card* card){
+    cardsAssigned.insert(card);
+}
+
+void User::unassignCard(Card* card){
+    cardsAssigned.erase(card);
+}
+
+string User::getId(){
+    return id;
+}
+
+string User::getName(){
+    return name;
+}
\ No newline at end of file
diff --git a/user.h b/user.h
new file mode 100644
index 0000000..a4a1b61
--- /dev/null
+++ b/user.h
@@ -0,0 +1,23 @@
+#ifndef USER_H
+#define USER_H
+
+#include <bits/stdc++.h>
+
+using namespace std;
+
+class Card;
+
+class User {
+    string id, name, email;
+    set<Card*> cardsAssigned;
+    public:
+        User(string name, string email, string id);
+        void myCards();
+        void printUser();
+        void addCard(Card* card);
+        void unassignCard(Card* card);
+        string getName();
+        string getId();
+};
+
+#endif
\ No newline at end of file
diff --git a/utils.h b/utils.h
new file mode 100644
index 0000000..f945d7a
--- /dev/null
+++ b/utils.h
@@ -0,0 +1,22 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+vector<string> tokenize(string input, char delimiter){
+    vector<string> ans;
+    int i=0;
+    string current_word = "";
+    while(i<input.length()){
+        if(input[i]==delimiter){
+            if(current_word.length() > 0)
+                ans.push_back(current_word);
+            current_word="";
+        } else {
+            current_word += input[i];
+        }
+        i++;
+    }
+    if(current_word.length()>0) 
+        ans.push_back(current_word);
+    return ans;
+}
\ No newline at end of file