#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int N = 3e5 + 5, mod = 1e9 + 7;
const ll inf = 9e18;
int n;
ll a[N];
int main() {
ios_base::sync_with_stdio(0); cin.tie(0);
// freopen(".INP", "r", stdin);
// freopen(".OUT", "w", stdout);
cin >> n;
ll mx = -inf, mn = inf;
for (int i = 1; i < n; ++i) {
cin >> a[i];
a[i] += a[i - 1];
mx = max(mx, a[i]);
mn = min(mn, a[i]);
}
int ans = -1;
for (int i = 1; i <= n; ++i) {
if (i + mn < 1 || i + mx > n) continue;
if (ans != -1) {
cout << -1;
return 0;
}
ans = i;
}
if (ans == -1) cout << -1;
else for (int i = 0; i < n; ++i) cout << ans + a[i] << ' ';
}
