using System;

public class Program

{

    class Animal

    {

        public void Eat()

        {

            Console.WriteLine("eating,,,");

        }

    }

    class Dog : Animal

    {

        public void Bark()

        {

            Console.WriteLine("barking,,,");

        }

    }

    class Puppy : Dog

    {

        public void Weep()

        {

            Console.WriteLine("weeping,,,");

        }

    }

    public static void Main()

    {

        Puppy puppy = new Puppy();

        puppy.Eat();

        puppy.Bark();

        puppy.Weep();

    }

}