#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);
	}
	int i = -1; int diag = -1;
	for(int j = 0; j < 3; ++ j) {
		int d = norm(ps[(j+2)%3] - ps[(j+1)%3]);
		if(diag < d)
			diag = d, i = j;
	}
	Point d1 = ps[(i+1)%3] - ps[i];
	Point d2 = ps[(i+2)%3] - ps[i];
	Point p = ps[(i+1)%3] + d2;
	if(norm(d1) != norm(d2) || norm(p - ps[i]) != diag) {
		puts("-1");
	}else {
		cout << p.real() << " " << p.imag() << endl;
	}
	return 0;
}