using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;

class SeriesOfLetters
{
    static void Main(string[] args)
    {
        string text = Console.ReadLine();
        string pattern = @"\w+";
        string replacementPattern = @"/(\w)\1*/g";

        Regex regex = new Regex(pattern);
        Regex replacementRegex = new Regex(replacementPattern);

        MatchCollection matches = replacementRegex.Matches(text);
        string result = "";
        foreach (var item in matches)
        {
            Console.WriteLine(item);
        }

        Console.WriteLine(result);
    }
}