using System;
using Microsoft.CSharp.RuntimeBinder.Binder;

namespace POOLProject
{
	public class Duck
	{
		public void Quack ()
		{
			Console.WriteLine ("Duck quaks *quack quack*");
		}
	}
	public class SillyDog
	{
		public void Quack ()
		{
			Console.WriteLine("Dog quacks *woof woof*");
		}
	}

	class MainClass
	{
		public static void Main (string[] args)
		{
			Duck d1 =  new Duck();
			Duck d2 = new Duck();
			SillyDog d3 = new SillyDog();

			MakeSound(d1);
			MakeSound(d2);
			MakeSound(d3);

		}
		public static void  MakeSound(dynamic obj)
		{
			obj.Quack();
		}
	}
}