using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var t1 = GetDomains(new Uri("http://client.example.com"));

        Console.WriteLine(t1.Item1);

        Console.WriteLine(t1.Item2);

        var t2 = GetDomains(new Uri("http://program.live.example.com"));

        Console.WriteLine(t2.Item1);

        Console.WriteLine(t2.Item2);

        var t3 = GetDomains(new Uri("http://sample.local.example.com "));

        Console.WriteLine(t3.Item1);

        Console.WriteLine(t3.Item2);

        var t4 = GetDomains(new Uri("http://test.dev.example.com"));

        Console.WriteLine(t4.Item1);

        Console.WriteLine(t4.Item2);

    }

    public static Tuple<string, string> GetDomains(Uri url)

    {

        var domains = url.Host.Substring(0, url.Host.LastIndexOf(".")).Split('.');

        var subDomain = string.Join("/", domains.Take(domains.Length - 1));

        var mainDomain = domains.Last();

        return Tuple.Create(mainDomain, subDomain);

    }

}