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

class Program
{
    static void Main(string[] args)
    {
        Dictionary<String, int> allWords = new Dictionary<string, int>();

        String[] inputWords = Console.ReadLine().Split();

        for (int i = 0; i < inputWords.Length; i++)
        {
            String currentWord = inputWords[i];

            if (!allWords.ContainsKey(currentWord))
            {
                allWords.Add(currentWord, 1);
            }
            else
            {
                allWords[currentWord]++;
            }
        }

        StringBuilder result = new StringBuilder();

        foreach (var word in allWords)
        {
            for (int j = 0; j < word.Value; j++)
            {
                result.Append(word.Key + " ");
            }

            result.Length--;
            result.Append("\n");
        }

        Console.WriteLine(result.ToString().TrimEnd());
    }
}