#include <iostream>
using namespace std;
 
class A
{
public:
	void print() const { cout << "A" << endl; }
};
 
class B : public A
{
public:
	void print() const { cout << "B" << endl; }
};
 
class C
{
public:
	virtual void print() const { cout << "C" << endl; }
};
 
class D : public C
{
public:
	void print() const { cout << "D" << endl; }
};
 
 
int main() {
	A* a = new B;
	a->print();
 
	C* c = new D;
	c->print();
	// your code goes here
	return 0;
}

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