using System;

public class Animal{

   public void eat(){Console.WriteLine("Eating ....");}

}

public class Cat:Animal{

    public void walking(){Console.WriteLine("Walking .... ");}

}

public class BabyCat:Cat{

    public void sleeping(){Console.WriteLine("Mewing .... ");}

}

public class Program

{

    public static void Main()

    {

        BabyCat c1 = new BabyCat();

        c1.eat();

        c1.walking();

        c1.sleeping();

    }

}