using System;

​

namespace Test

    {

public class A

{

  public  void m()

    {

      Console. WriteLine ("A");

     }

  public class B: A

     {

      public void m1()

         {

            Console. WriteLine ("B");

          }

       public static void main() 

          {

         ((A)new B()).m();

         ((B)new B()).m1();

          }

      }

}

}