using System;

namespace Nested
{
    internal class Program
    {
        private static void Main()
        {
            new Greeting("Alex").Run();
        }

        private sealed class Greeting
        {
            private readonly string name;

            internal Greeting(string name)
            {
                this.name = name;
            }

            internal void Run()
            {
                Helper.Say(name);
            }

            private static class Helper
            {
                internal static void Say(string name)
                {
                    Console.WriteLine("Hello, " + name);
                }
            }
        }
    }
}