using System;

using System.Web;

using System.Text;

using Microsoft.AspNetCore.WebUtilities;

public class Program

{

    public static void Main()

    {

​

        var decoded = WebEncoders.Base64UrlDecode("U0VMRUNUIERJU1RJTkNUIGNvbmNlcHRfbmFtZSwgeWVhcl9vZl9iaXJ0aCwgYWNjZXNzaW9uX2lkIEZST00gb21vcC5wZXJzb24gcCAKSk9JTiBvbW9wLnJhZGlvbG9neV9vY2N1cnJlbmNlIHIgT04gci5QZXJzb25fSWQgPSBwLlBlcnNvbl9JZApKT0lOIG9tb3AuY29uY2VwdCBjIE9OIHAuZ2VuZGVyX2NvbmNlcHRfaWQgPSBjLmNvbmNlcHRfaWQKV0hFUkUgeWVhcl9vZl9iaXJ0aCA8IDE5ODA");

        Console.WriteLine(Encoding.UTF8.GetString(decoded));

    }

}