using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int rowsCount = int.Parse(Console.ReadLine());

        HashSet<string> usernames = new HashSet<string>();

        for (int i = 0; i < rowsCount; i++)

        {

            string username = Console.ReadLine();

​

            usernames.Add(username);

        }

        foreach (string username in usernames)

        {

            Console.WriteLine(username);

        }

    }

}