#include <bits/stdc++.h> using namespace std; int d[300008]; long long a[300008]; signed main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int n; cin >> n; for (int i = 2; i <= n; ++i) cin >> d[i]; for (int i = 2; i <= n; ++i) a[i] = a[i - 1] + d[i]; long long C = *min_element(a + 1, a + n + 1) - 1; for (int i = 1; i <= n; ++i) a[i] -= C; long long mx = *max_element(a + 1, a + n + 1); if (mx != n) cout << -1; else {for (int i = 1; i <= n; ++i) cout << a[i] << ' ';} }