using System;
using System.Collections.Generic;

namespace _06._Replace_Repeating_Chars
{
    class Program
    {
        static void Main(string[] args)
        {
            string Word = Console.ReadLine();
            List<char> notDuplicate = new List<char>();
            for (int i = 0; i < Word.Length-1; i+=2)
            {

                char symbol = Word[i];
                char symbolCheck = Word[i + 1];
                if (symbol==symbolCheck)
                {
                    continue;
                }
                else
                {
                    notDuplicate.Add(symbol);
                }



            }
            for (int i = Word.Length-1; i < Word.Length; i++)
            {
                char symbol = Word[i];
                notDuplicate.Add(symbol);

            }



            Console.WriteLine(string.Join("",notDuplicate));
        }
    }
}