second

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace mainSolution
{
    static class Program
    {
        static void Main(string[] args)
        {
            char[] sign = { ' ', '.', ',', ';', ':', '?', '!', '-'};
            string[] a = Console.ReadLine().Split(sign, StringSplitOptions.RemoveEmptyEntries);
            for (int i = 0; i < a.Length; ++i)
            {
                bool check = true;
                for (int j = 0; j < a.Length; ++j)
                {
                    if (i == j)
                        continue;
                    if (a[i].ToLower() == a[j].ToLower())
                    {
                        check = false;
                        break;
                    }
                }
                if (check)
                    Console.Write(a[i] + " ");
            }
        }

    }
}