This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define endl '\n'
#define int long long
using namespace std;
int N = 0;
vector<int> D;
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cin >> N;
  for (int i = 0; i < N-1; i++){
    int temp = 0;
    cin >> temp;
    D.push_back(temp);
  }
  if (D[0] == 1){
    cout << "1 2" << endl;
  }
  else if (D[0] == -1){
    cout << "2 1" << endl;
  }
  else{
    cout << "-1" << endl;
  }
}
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