#include<bits/stdc++.h>
using namespace std;
signed main() {
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n;
cin >> n;
vector<tuple<double, int, int, int, int>> lines(n);
for (int i = 0; i < n; i++) {
int x1, y1, x2, y2;
cin >> x1 >> y1 >> x2 >> y2;
if (y2 < y1) {
swap (y1, y2);
swap(x1, x2);
}
if (x2 < x1) {
swap (y1, y2);
swap(x1, x2);
}
double m = (y2-y1);
if (x2 != x1) m /=(x2-x1);
double c = y1-m*x1;
c *= -1;
if (x1 == x2) c = x1;
lines[i] = {c, x1, x2, y1, y2};
// cout << "INFO OTHER " << c << " " << x1 << " " << y1 << " " << x2 << " " << y2 << endl;
}
sort(lines.begin(), lines.end());
int x = get<2>(lines[0]);
int y = get<4>(lines[0]);
for (int i = 1; i < n; i++) {
auto [c, x1, x2, y1, y2] = lines[i];
cout << x << " " << y << " " << x1 << " " << y1 << "\n";
x = x2;
y = y2;
}
}
//problem is that the wrong vertices are matched so the whole lines overlap
