using System;

​

class Animal

{

    public void Greet()

    {

        Console.WriteLine("I am animal");

    }

}

​

class Cat:Animal

{

    public void Meow()

    {

         Console.WriteLine("Meow");

    }

}           

public class Program

{

    public static void Main()

    {

        Animal Greet = new Animal();

        Cat Cat1 = new Cat();

        Cat1.Meow();

    }

}