using System;
 
public class Test
{
  class A      { public        virtual              void PrintMessage() { Console.Write("A"); } }
  class B : A  { public sealed         override     void PrintMessage() { Console.Write("B"); } }
  class C : A  { public                         new void PrintMessage() { Console.Write("C"); } }
 
  static void Main(string[] args)  
  {  
    var b = new B(); 
    var c = new C();  
    ((A)c).PrintMessage();  
    ((A)b).PrintMessage();  
    c.PrintMessage();  
  }
}

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