#include <bits/stdc++.h>
using namespace std;
#define all(v) v.begin(), v.end()
#define endl '\n'
#define pl(var) " [" << #var << ": " << (var) << "] "
#define ll long long
void solve() {
int n; cin >> n;
vector<int> diff(n - 1); for (int i = 0; i < n - 1; i++) cin >> diff[i];
vector<int> ans(n, 0);
for (int i = 0; i < n - 1; i++) {
ans[i + 1] = ans[i] + diff[i];
}
int mn = *min_element(all(ans));
for (int i = 0; i < n; i++) {
ans[i] -= mn - 1;
}
if (*max_element(all(ans)) != n) {
cout << -1 << endl;
return;
}
for (auto A : ans) cout << A << ' ';
cout << endl;
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int T = 1;
// cin >> T;
while (T--)
solve();
}
