class A
{
protected:
	int x;
	int y;

public:
	A(int _x, int _y)
	
	virtual int getX(); 
	virtual int getS(); 

};

class B
{
protected:
	int x;
	int z;

public:
	B(int _x, int _z)
	
	virtual int getX();
	virtual int getS(); 
};