using System;

class Animal {
	public virtual void talk() {
		Console.Write("...\n");
	}
}

class Cat : Animal {
	public override void talk() {
		Console.Write("Meow!\n");
	}
}

class NyanCat : Cat {
	// we dont want this one
	public virtual void talk() {
		Console.Write("NyanNyanNyanNyanNyanNyan Batman!\n");
	}
}

class Dima : NyanCat {
	public override void talk() {
		Console.Write("DIMA THE BEST!\n");
	}
}

public class Test {
	public static void Main() {
		Animal a = new Animal();
		a.talk();  // ...
		
		a = new Cat();
		a.talk();  // Meow
		
		a = new NyanCat();
		a.talk();  // Meow
		
		a = new Dima();
		a.talk();  // Meow
		
		// the reason: Cat.print() is not virtual,
		//   so we have broken the chain of virtuality
		
		/********************/
		
		// a new chain starts from NyanCat class
		
		NyanCat cat = new NyanCat();
		cat.talk();  // Batman!
		
		cat = new Dima();
		cat.talk();  // THE BEST
	}
}