using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Kitten.Breed.PERSIAN);

        Console.WriteLine( Kitten.Spy.GetKittenSecret());

    }

}

​

public class Kitten

{

    private readonly string name;

    public Kitten(string name)

    {

        this.name = name;

    }

    public class Breed

    {

        public const string PERSIAN = "Persian";

        public const string SIAMESE = "Siamese";

    }

    private static string Secret = "Secret";

    internal class Spy

    {

        public static string GetKittenSecret()

        {

            return Secret;

        }

    }

}