using System;

public class Program

{

    //base class, Animal

    public class Animal

    {

        public void Talk()

        {

            Console.WriteLine("Animal talk");

        }

    };

    //inherits Animal class

    class Dog : Animal

    {

        public void Talk()

        {

            Console.WriteLine("Dog talk");

        }

    };

    public static void Main()

    {

        Animal a1 = new Animal();

        a1.Talk();

        Dog a2 = new Dog();

        a2.Talk();

    }

}