#include 

class Point2D {
	protected:
		int x, y;
	public:
		Point2D (int x1, int y1);
		void print ();
};

class Point3D : public Point2D {
	private:
		int z;
	public:
		Point3D (int x1, int y1, int z1);
		void print ();
};

Point2D::Point2D (int x1, int y1) { x = x1; y = y1; }
void Point2D::print () { cout << x << " " << y << endl; }

Point3D::Point3D (int x1, int y1, int z1) : Point2D (x1, y1) { z = z1; }
void Point3D::print () { cout << x << " " << y << " " << z << endl; }

int main () {
	Point2D pt2d (1,2);
	Point3D pt3d (10,20,30);

	pt2d.print();
	pt3d.print();

	pt2d = pt3d;
	pt2d.print();

	return 0;
}