#include <iostream>
class A{
public:
A(){ std::cout << "A"; }
virtual ~A(){ std::cout << "~A"; }
};
class B: public A{
public:
B(){ std::cout << "B"; }
~B(){ std::cout << "~B"; }
};
int main(){
A * a = new B();
delete a;
return 0;
}