using System;

public class Program

{

    public static void Main()

    {

        string original = "{<RESPONSE>   <RESPONSE_TEXT>Registered P_UK4EZI</RESPONSE_TEXT>   <RESULT>OK</RESULT>   <RESULT_CODE>-1</RESULT_CODE>   <TERMINATION_STATUS>SUCCESS</TERMINATION_STATUS>   <MAC_KEY>KZzTDdNErHVNZzRRfKyrbuAj++J20IAF4XpmsmQFjdV7G4PauwHkUobkhEzjPRbD9GNUq5EtoOauxTSZHgsDeLx6FAWasSKb2FcsC7SMmCTV5VW4Wd5w+9tP1Hzy93wnedKPggExJbxA3BH8xvFjqvmiCHjB92fsPfHWXcqfMHhoRW8quA/B6jx44dm</MAC_KEY>   <MAC_LABEL>P_UK4EZI</MAC_LABEL>   <ENTRY_CODE>1570</ENTRY_CODE> </RESPONSE>}";

        Console.WriteLine(original.Replace("{","").Replace("}",""));

    }

​

}