using System;

using System.Collections.Generic;

​

public class HelloWorld {

  public static void Main() {

      Request request = new Request();

      HashSet<string> originalWeekDays = new HashSet<string>(request.weekDays);

      originalWeekDays.Remove("Sat");

      Console.WriteLine(String.Join(", ", originalWeekDays));

      Console.WriteLine(String.Join(", ", request.weekDays));

  }

}

public class Request{

    public string[] weekDays = new string[] { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };

}