using System;

namespace OFS
{
    public class Test
    {
        public static void Main()
        {
            IClass instance = MyFactory.Construct();
            Console.Write(instance.GetMessage());
        }
    }

    public static class MyFactory
    {
        public static IClass Construct()
        {
            return new MyClass();
        }
    }

    internal class MyClass : IClass
    {
        public string GetMessage()
        {
            return "Hello World";
        }
    }

    public interface IClass
    {
        string GetMessage();
    }
}