using System.Text;
using System;

public class Hello
{
    static void Main()
    {
        var s = Console.ReadLine().Trim();
        getAns(s);
    }
    static void getAns(string s)
    {
        var sb = new StringBuilder();
        var pre = '0';
        foreach (var x in s)
        {
            if (x != pre) sb.Append(x);
            pre = x;
        }
        Console.WriteLine(sb);
    }
}