using System;

​

public class Program

{

  public static void Main()

  {

   B obj = new B();

      obj.j=2;

      obj.display();

  }

​

abstract class A{

    int i;

    public abstract void display();

}

  class B:A

  {

      public int j;

      public override void display()

      {

          Console.WriteLine(j);

      }

  }

}

​