#include <bits/extc++.h>
using namespace std;
using pii = pair<int, int>;
#define fr first
#define sc second
pii pts[200000];
int dx, dy;
bool cmp(pii a, pii b) {
int va = a.fr * dy - a.sc * dx;
int vb = b.fr * dy - b.sc * dx;
if (va != vb)
return va < vb;
return a < b;
}
signed main() {
int n;
cin >> n;
for (int i = 0; i < 2 * n; i ++)
cin >> pts[i].fr >> pts[i].sc;
dx = pts[0].fr - pts[1].fr;
dy = pts[0].sc - pts[1].sc;
sort(pts, pts + 2 * n, cmp);
for (int i = 0; i < n - 1; i ++)
cout << pts[2 * i + 1].fr << " " << pts[2 * i + 1].sc << " " << pts[2 * i + 2].fr << " " << pts[2 * i + 2].sc << '\n';
}
