#include <iostream>
#include <complex>
using namespace std;
typedef complex<int> Point;
int main() {
	Point ps[3];
	for(int i = 0; i < 3; ++ i) {
		int x, y;
		cin >> x >> y;
		ps[i] = Point(x, y);
	}
	for(int i = 0; i < 3; ++ i) {
		Point d1 = ps[(i+1)%3] - ps[i];
		Point d2 = ps[(i+2)%3] - ps[i];
		if(norm(d1) != norm(d2)) continue;
		Point p = ps[(i+1)%3] + d2;
		if(norm(p - ps[i]) != norm(ps[(i+1)%3] - ps[(i+2)%3])) continue;
		cout << p.real() << " " << p.imag() << endl;
		return 0;
	}
	cout << "-1" << endl;
	return 0;
}