#include <bits/stdc++.h>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    double x,y,x1,y1,x2,y2,x3,y3,a,b;
    while(cin >>x1>>y1>>x2>>y2>>x2>>y2>>x3>>y3)){
        cin >>x1>>y1>>x2>>y2>>x2>>y2>>x3>>y3;
        a=(x1+x3)/2;
        b=(y1+y3)/2;
        x=2*a-x2;
        y=2*b-y2;
        cout<<x <<" "<<y <<"\n";
    }
    return 0;
}