using System;
class Program
{
    static void Main(string[] args)
    {
        int[] tabel = new int[100];
        int getal = int.Parse(Console.ReadLine());
        int teller = 0;
        while(0 <= getal && getal <100)
        {
            tabel[getal] = tabel[getal]+1;
            getal = int.Parse(Console.ReadLine());
        }
        while(teller < 100)
        {

            if(0 < tabel[teller])
            {
                Console.Write(teller);
            }
            teller++;
        }
    }
}