using System.Numerics;

public class Program
{
    public static void Main()
    {

         //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        string str = Console.ReadLine() ?? string.Empty;


        for(int i = 0; i < str.Length-1; i++)
        {
            if(str[i] ==str[i+1])
            {
                continue;
            }
            Console.Write(str[i]);
        }
        Console.WriteLine(str[str.Length-1]);
    }
}