using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var l=new List<int>();

        while(true)

        {

            var i=Console.ReadLine();

            if(i=="quit")

            break;

            var n=int.Parse(i);

            if(l.Contains(n))

                continue;

            l.Add(n);

        }

        foreach(var x in l)

            Console.WriteLine(x);

    }

}