#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define REP(i,m,n) for(int i=(int)(m); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define RREP(i,m,n) for(int i=(int)(m); i>=(int)(n); i--)
#define rrep(i,n) RREP(i,n-1,0)
#define all(v) v.begin(), v.end()
const int inf = 1e9+7;
const ll longinf = 1LL<<60;
const ll mod = 1e9+7;
const ld eps = 1e-10;

void solve() {
  ll a, p; cin >> a >> p;
  cout << -1 << "\n";
}
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  int t; cin >> t;
  while(t--) {
    solve();
  }
  return 0;
}