using System;

namespace Studytonight

{

    public class Parent

    {

        public void DisplayParentsAB()

        {

            Console.WriteLine("A and B are my parents");

        }

    }

    public class ChildC: Parent

    {

        public void DisplayChildC()

        {

            Console.WriteLine("I am the child C");

        }

    }

    public class ChildD: Parent

    {

        public void DisplayChildD()

        {

            Console.WriteLine("I am the child D");

        }   

    }

    public class Program

    {

        public static void Main(string[] args)

        {

            ChildC cc = new ChildC();

            ChildD cd = new ChildD();

            //accessing parent class

            cc.DisplayChildC();

            cc.DisplayParentsAB();  

            // accessing parent class

            cd.DisplayChildD();

            cd.DisplayParentsAB();  

        }

    }

}