fourth point

#include<bits/stdc++.h>
using namespace std;
int main()
{
   double x1, x2, x3, x4, x5, y1, y2, y3, y4, y5;
   while(cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3 >> x4 >> y4)
   {
      x5 = (x1 + x4) - x2;
      y5 = (y1 + y4) - y2;
      printf("%lf %lf\n", x5, y5);
   }
   return 0;
}