using System;

public class Program

{

    public static void Main()

    {

        var str = "bob";

        var isBob = str is "bob";

        var isntBob = str is "alice";

        var couldBeBob = str is "bob" or "alice";

        Console.WriteLine(isBob);

        Console.WriteLine(isntBob);

        Console.WriteLine(couldBeBob);

    }

}