// client.cs: A client of the classes in namespace Intro


/* 
    namespace Intro
      internal class A
      public class B
      public class C
*/


using System;
using Intro;

class Client {

  public static void Main(){
//  A a = new A();   // Compiler error: Class A is internal in Intro
    B b = new B();
    C c = new C();

    Console.WriteLine("{0} {1}", b, c);
  }
}