#include <iostream.h>

using namespace std;

class B           { public: void f(){cout <<"BB"; } };
class D1: public B{ public: void f(){cout <<"D1"; } };
class D2: public B{ public: void f(){cout <<"D2"; } };

main(){
	B* p;
          p = new D1; p->f(); p->B::f();
          p = new D2; p->f(); p->B::f();
	cout << endl;
}//end main