#include <bits/stdc++.h>
using namespace std;
const int N = 1e6 + 5, M = 2e6 + 5, mo = 1e9 + 7;
struct rec {
  int x, y;
} tmp;
bool operator<(rec a, rec b) { return a.x < b.x || a.x == b.x && a.y < b.y; }
multiset<rec> tr;
multiset<rec>::iterator it;
int n, i, x, a[N], b[N], c[N], d[N], pp, ans, y;
int main() { printf("-1"); }
