BOJ20920.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
import java.util.stream.Collectors;

public class BOJ20920 {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());

        int N = Integer.parseInt(st.nextToken());
        int M = Integer.parseInt(st.nextToken());
        int[][] arr = new int[N][3];
        Map<String, Integer> map = new HashMap<>();
        
        for(int i = 0; i < N; i++){
            String str = br.readLine();
            if(str.length() >= M){
                int cnt = map.getOrDefault(str, 0);
                map.put(str, cnt+1);
            }
        }

        List<String> words = map.keySet().stream().collect(Collectors.toList());

        words.sort((o1, o2) -> {
            int c1 = map.get(o1);
            int c2 = map.get(o2);

            if(c1 == c2){
                if(o1.length() == o2.length()){
                    return o1.compareTo(o2);
                }
                return o2.length() - o1.length();
            }
            return c2-c1;
        });

        StringBuilder sb = new StringBuilder();
        for(int i = 0; i <  words.size(); i++){
            sb.append(words.get(i)).append("\n");
        }
        System.out.print(sb);
    }
}