#include <iostream>
#include <cmath>

using namespace std;

int main()
{
  int x[4], y[4];
  for(int i=0; i<3; ++i){
    cin >> x[i] >> y[i];
  }

  for(int i=0; i<3; ++i){
    if(hypot(x[i]-x[(i+1)%3], y[i]-y[(i+1)%3]) == hypot(x[i]-x[(i+2)%3], y[i]-y[(i+2)%3])){
      if(!((x[(i+1)%3] - x[i]) * (x[(i+2)%3] - x[i]) + (y[(i+1)%3] - y[i]) * (y[(i+2)%3] - y[i]))){
        x[3] = x[(i+1)%3] + x[(i+2)%3] - x[i];
        y[3] = y[(i+1)%3] + y[(i+2)%3] - y[i];
        cout << x[3] << " " << y[3] << endl;
        return 0;
      }
    }
  }
  cout << -1 << endl;
  return 0;
}