using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        var bytes = Convert.FromBase64String("w7w=");

      int length = Encoding.UTF8.GetString(bytes).Length;

        Console.WriteLine(length);

             bytes = Convert.FromBase64String("Zm9v");

       length = Encoding.UTF8.GetString(bytes).Length;

        Console.WriteLine(length);  

    }

}