using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine(GetString(Console.ReadLine()));

    }

    private static string GetString(string inputString){

        string resultString = "";

        var charArray = inputString.ToCharArray();

        char currentChar;

        int passCount = 0;

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

        {

            currentChar = charArray[i];

            passCount++;

            if(i+1 < charArray.Length ||!currentChar.Equals(charArray[i+1])){

                resultString += $"{passCount}{currentChar}";

                currentChar = charArray[i+1];

                passCount = 0;

            }

        }

        return resultString;

    }

}