Baekjoon #1181

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Comparator;
import java.util.StringTokenizer;

public class Main {
	static String[] arr;
	public static void main(String[] args) throws IOException{
		FastReader rd = new FastReader();
		
		int size = rd.nextInt();
		
		arr = new String[size];
		for(int i = 0; i < size; i++) {
			arr[i] = rd.nextLine();
		}
		
		Arrays.sort(arr, new Comparator<String>() {
			public int compare(String s1, String s2) {
				return s1.length() == s2.length() ? s1.compareTo(s2) : s1.length() - s2.length();
			}
		});
		
		StringBuilder sb = new StringBuilder();
		sb.append(arr[0]).append("\n");
		for(int i = 1; i < size; i++) {
			if(arr[i - 1].equals(arr[i])) {
				continue;
			}
			sb.append(arr[i]).append("\n");
		}
		System.out.print(sb);
	}
	static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        String next() {
            while(st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                }
                catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() { return Integer.parseInt(next()); }
        long nextLong() { return Long.parseLong(next()); }
        double nextDouble() { return Double.parseDouble(next()); }
        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            }
            catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
}

import sys

def input():
    return sys.stdin.readline().rstrip()

N = int(input())
arr = []

for i in range(N):
    arr.append(input())

arr = list(set(arr))
arr.sort(key = lambda x : (len(x), x))

for i in arr:
    print(i)