import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Scanner;


public class Example {


    private static int n;
    private static String[] commands;
    private static String m ="";

    public static void main(String[] args) {
        try {
        Scanner scanner = new Scanner(System.in);
        n = scanner.nextInt();
        if(n>=0 && n<=100){
            commands = new String[n];
            for (int i = 0; i < n; i++) {
                BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
                commands[i] = in.readLine();
                if(commands[i].length()>30 || commands[i].length()==0){
                    throw new IOException();
                }
            }
            Arrays.sort(commands);
            for(String s: commands){
                if(s.equals(m)){
                    System.out.println(s);
                }
                else{
                    m=s;
                }

            }
        }
        } catch (IOException e) {
        }

    }

}