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>
using namespace std;
int main(){
int n; cin >> n;
int d[n - 1]; for(int i = 0; i < n - 1; i++) cin >> d[i];
if(d[0] == 1) cout << 1 << ' ' << 2 << '\n';
else if(d[0] == -1) cout << 2 << ' ' << 1 << '\n';
else cout << -1 << '\n';
}
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