using System;

using System.Collections;

using System.Linq;

public class Program

{

    enum Days1 {Sat, Sun, Mon, Tue, Wed, Thu, Fri};

    enum Days2 {Sat, Sun };

    public static void Main()

    {

        var days1 = Enum.GetValues(typeof(Days1))

            .Cast<Days1>()

            .Select(v => v.ToString())

            .ToList();

        var days2 = Enum.GetValues(typeof(Days2))

            .Cast<Days2>()

            .Select(v => v.ToString())

            .ToList();

        var daysIntersect = days1.Intersect(days2).ToList();

        Console.WriteLine(string.Join(", ", daysIntersect));

    }

}