#include <bits/stdc++.h>
using ll = long long;
using namespace std;
int main() {
std::ios_base::sync_with_stdio(false);
std::cin.tie(nullptr);
ll n;
cin >> n;
vector<ll> d(n - 1);
for (auto &i : d) {
cin >> i;
}
vector<ll> a(n);
a[0] = 1;
ll minn = 1;
ll maxx = 0;
for (int i = 1; i < n; i++) {
a[i] = a[i - 1] + d[i - 1];
minn = min(minn, a[i]);
maxx = max(maxx, a[i]);
}
if (minn != 1) {
maxx = 0;
for (int i = 0; i < n; i++) {
a[i] = a[i] - minn + 1;
maxx = max(maxx, a[i]);
}
}
if (maxx == n) {
for (auto i : a) {
cout << i << " ";
}
} else {
cout << -1 << "\n";
}
}
