using System;
using System.Globalization;
using System.Linq;
using System.Collections.Generic;
using System.Reflection;
 
public class Test
{
        class Entity { }
        class Item : Entity { }
        class Actor : Entity { }
 
	public static void Main()
	{
    	    int iterations = 10;
            Type pType = typeof(Entity);
            var children = Enumerable.Range(1, iterations)
                           .SelectMany(i => Assembly.GetExecutingAssembly().GetTypes()
                           .Where(t => t.IsClass
                                    && pType.IsAssignableFrom(t) && t != pType)
                           .Select(t => t.Name));
            var all = string.Join(",", children.ToArray());
            Console.Write(all);
    }
}

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