import io:*;

obj Vec2 {
	var x: int;
	var y: int;

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

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

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

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

};

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

fun main(): int {
	var vector1: Vec2;
	var vector2: Vec2;
	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();
	*/
	var addition: Vec2 = vector1 + vector2;
	print("\n");
	addition.print();
	print("\nSubtraction\n");
	vector2.x = 100;
	vector2.y = 70;
	var subtraction: Vec2 = vector1 - vector2;
	print("\n");
	print(subtraction.x); print(" "); print(subtraction.y);

	print("\n");

	return 0;
}