#include <bits/stdc++.h> using namespace std; long long i, j, l, r, mid, p, q, k, t, n, m, a, b, c, d, ans, cnt, res, arr[1000005]; const long long mod = 999993143, mod2 = 999993469; string s; bool check; int main(){ ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); cin >> n; for (i = 2; i <= n; i += 1){ cin >> arr[i]; } res = 0; a = 1; b = n; for (i = 2; i <= n; i += 1){ res += arr[i]; if (res > 0){ b = min(b, n - res); } else{ a = max(a, abs(res) + 1); } } if (a != b){ cout << -1 << "\n"; } else{ cout << a << " "; res = 0; for (i = 2; i <= n; i += 1){ res += arr[i]; cout << a + res << " "; } } }