#include <iostream>
#include <fstream>
#include <cmath>
#include <iomanip>

using namespace std;

ifstream fin("test.in");
ofstream fout("test.out");

pair<double,double> rot(double x,double y,double x2,double y2,double U)
     {
         x -= x2;
         y -= y2;
         double new_x = x * cos(U) - y * sin(U);
         double new_y = x * sin(U) + y * cos(U);
        new_x += x2;
        new_y += y2;
    return make_pair(new_x,new_y);
    }

    pair<double,double> sim(double x,double y,double x2,double y2)
    {
       return make_pair(x2-x,y2-y);
    }

int main()
{
    int n;
    cin >> n;

    cout << 0 << " " << 0 << "\n";
    cout.flush();

    double x,y;

    while (cin >> x >> y)
    {
        pair<double,double> p = rot(x,y,0,0,M_PI);
        cout << fixed << setprecision(7) << p.first << " " << p.second <<"\n";
        cout.flush();
    }

}