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

namespace string_6
{
    class Program
    {
        static void Main(string[] args)
        {
            string sequence = Console.ReadLine();
            var finalstring = new StringBuilder();
            finalstring.Append(sequence[0]);
            for (int i = 0; i < sequence.Length - 1; i++)
            {
                if (sequence[i] != sequence[i + 1])
                {
                    finalstring.Append(sequence[i + 1]);
                }
            }
            Console.WriteLine(finalstring);
        }
    }
}