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


namespace notTheBestSolution
{
    class Program
    {
        public static void Main(string[] args)
        {
            string input = Console.ReadLine();
            List<char> chars = input.ToList();

            for (int i = 1; i < chars.Count; i++)
            {
                if (chars[i] == chars[i - 1])
                {
                    chars.RemoveAt(i);
                    i--;
                }
            }

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