using System;

​

public class Program

{

    public static void Main()

    {

        string MifareNumber = "9AD0D0BB";

        string substr1 = MifareNumber.Substring(6, 2);

        string substr2 = MifareNumber.Substring(4, 2);

        string substr3 = MifareNumber.Substring(2, 2);

        string substr4 = MifareNumber.Substring(0, 2);

        var MifareReverse = substr1 + substr2 + substr3 + substr4;

        Console.Write(MifareReverse);

        var Token = Convert.ToInt64(MifareReverse, 16).ToString().Remove(0, 2);

        Console.WriteLine("\n" + Token);

    }

}