Q17.java

// Java Substring Comparisionss
import java.util.Scanner;

public class Q17 
{
    public static String getSmallestAndLargest(String s, int k) {
        String smallest = "";
        String largest = "";
        
        // Complete the function
        // 'smallest' must be the lexicographically smallest substring of length 'k'
        // 'largest' must be the lexicographically largest substring of length 'k' 
        smallest = "z";
        largest = "a";
        if(k == s.length())
        {
            smallest = s;
            largest = s;
        }
        else 
        {
            for(int i = 0; i <= s.length() - k; i++) {
                String substr = s.substring(i, i + k);
                if(substr.compareTo(smallest) < 0)
                    smallest = substr;
                if(substr.compareTo(largest) > 0)
                    largest = substr;
            }
        }
        return smallest + "\n" + largest;
    }


    public static void main(String[] args) 
    {
        Scanner scan = new Scanner(System.in);
        String s = scan.next();
        int k = scan.nextInt();
        scan.close();  
        System.out.println(getSmallestAndLargest(s, k));
    }
}