using System;

public class Program

{

    public static void Main()

    {

        var input =  "AABBCCCCDAA";

        var result = Compress(input);

        Console.WriteLine(result);

    }

    // Compression algorithm. Ex: For "AABBCCCCDAA" , write a method to compress it to A2B2C4DA2

    public static string Compress(string value)

    {

        // TODO - Implement algorithm

        return value;

    }

}