using System;
using System.Linq;
namespace q218309203
{
	class Program
	{
		public static string cleanStr(string str) {
			string r = "";
			foreach (char c in str) {
				if (char.IsLetterOrDigit(c))
					r += c;
				else if (r.Length > 0 && r[r.Length - 1] != ' ')
					r += ' ';
   			}
			return r;
		}
		public static void Main(string[] args)
		{	
			Console.WriteLine(String.Join(" ", cleanStr(Console.ReadLine()).Split(' ').Distinct().ToArray()));
			Console.ReadKey(true);
		}
	}
}

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