ExtractSuperclass

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(); 

};