using System;

public class Program

{

    private string _str;

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

    //_str.ToArra().Where( x => x

    private string Zip(string s)

    {

        int firstIndex = 0;

        char[] temp = s.ToCharArray();

        char curChar = '\t';

        string result = string.Empty;

        for(int i = 0; i < temp.Length; ++i)

        {

            if(curChar != temp[i])

            {

                curChar = temp[i];

                firstIndex = i;

            }

            int nextIndex = i + 1;

            if(temp[nextIndex] != curChar && nextIndex <= temp.Length)

            {

                int charsCount = i - firstIndex;

                result += charsCount + curChar;

            }

        }

        return result;

    }

}