/*****/ #include #include using namespace atcoder; using namespace std; typedef long long ll; typedef pair P; #define rep(i,a,b) for(int i=a;i=b;i--) #define all(x) begin(x),end(x) const int MOD = 1e9 + 7; const int mod = 998244353; templatebool chmax(T& a, const T& b) { if (a < b) { a = b; return 1; } return 0; } templatebool chmin(T& a, const T& b) { if (b < a) { a = b; return 1; } return 0; } /*****/ int n; ll a[200009]; int main() { cin >> n; rep(i,0,n) cin >> a[i]; if (n<=2) { cout << -1 << endl; return 0; } vector P(n); vector p(n); rep(i,0,n) { P[i] = i+1; } rep(i,0,n) { p[i] = n-i; } rep(i,0,n) { if (0