using System;

public class Program

{

    public static void Main()

    {

        const string rfid = "4202201345";

        Console.WriteLine("Encoded rfid: " + DecToHex(rfid));

    }

    public static string DecToHex(string value)

    {

        return $"{value[..2]}{int.Parse(value[2..5]):X4}{int.Parse(value[5..]):X4}";

    }

}