#include <cstdio>
#include <iostream>
#include <string>

using namespace std;


class A
{

public:
    virtual void f() {
    printf <"~A.f "> ;
    }
    virtual ~A() {f();}
        };



class B : public A{


public:
  void f ()
  {printf<"~B.f ">;}
  ~B(){f();}

};


B b;
int main()
{
 A*a=new B();
 printf ("M ");
 delete a;
 return 0;

}