using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace _02.Worm_Ipsum
{
    class Program
    {
        static void Main(string[] args)
        {
            var inputLine = Console.ReadLine();
           var result = new List<string>();
            while (inputLine != "Worm Ipsum")
            {
                var line = inputLine.Split(new[] {'.'},StringSplitOptions.RemoveEmptyEntries);

                if (line.Length==1)
                {
                    var lineValid = inputLine.Split(new[] {' ','.','-'}, StringSplitOptions.RemoveEmptyEntries);

                    foreach (var word in lineValid)
                    {

                        var curentWord = "";
                        char curentChar;
                        var maxCounter = 0;
                        for (int i = 0; i < word.Length; i++)
                        {

                            var counter = 0;
                            var index = word.IndexOf(word[i]);
                            while (index !=-1)
                            {
                                counter++;
                                index = word.IndexOf(word[i], index + 1);
                            }
                            if (counter>=2 && maxCounter < counter)
                            {
                                 curentChar = word[i];
                                 maxCounter = counter;
                                for (int j = 0; j < word.Length; j++)
                                {
                                    curentWord += curentChar;
                                }

                            }

                        }
                        if (curentWord !="")
                        {
                            result.Add(curentWord);
                        }
                        else
                        {
                            result.Add(word);
                        }

                    }

                    Console.WriteLine(string.Join(" ",result)+".");
                }

                result.Clear();
                inputLine = Console.ReadLine();
            }

        }


    }
}