import io;

typedef Vec2 {
	int x;
	int y;

	void print() {
		print(x);
		print(" ");
		print(y);
	}

	Vec2 add(Vec2 other) {
		Vec2 toReturn;
		toReturn.x = x + other.x;
		toReturn.y = y + other.y;
		print();
		return toReturn;
	}

	Vec2 subtract(Vec2 other) {
		Vec2 toReturn;
		toReturn.x = x - other.x;
		toReturn.y = y - other.y;
		print();
		return toReturn;
	}

	Vec2 operator+(Vec2 other) {
		return add(other);
	}

};

Vec2 operator-(Vec2 lhs, Vec2 rhs) {
	return lhs.subtract(rhs);
}

int main() {
	Vec2 vector1;
	Vec2 vector2;
	vector1.x = 3;
	vector1.y = 9;
	vector2 = vector1;
	/* NOTE COMMENT
	Vec2 vector3;
	vector3.x = vector1.x + vector2.x;
	vector3.y = vector1.y + vector2.y;
	vector2.print();
	*/
	Vec2 addition = vector1 + vector2;
	print("\n");
	addition.print();
	print("\nSubtraction\n");
	vector2.x = 100;
	vector2.y = 70;
	Vec2 subtraction = vector1 - vector2;
	print("\n");
	print(subtraction.x); print(" "); print(subtraction.y);

	print("\n");
	
	return 0;
}