using System;

public class Program

{

    public static void Main()

    {

        var a = "a";

        var b = "c";

        var c = "a";

        var d = "c";

        Console.WriteLine(a.CompareTo(b));

        Console.WriteLine(b.CompareTo(a));

        Console.WriteLine(a.CompareTo(c));

        Console.WriteLine(b.CompareTo(b));

    }

}