#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n;
cin >> n;
vector<int> d(n - 1);
for (int i = 0; i < n - 1; i++) {
cin >> d[i];
}
long long mx = 0, mn = 0, s = 0;
for (int i = 0; i < n - 1; i++) {
s += d[i];
mn = min(mn, s);
mx = max(mx, s);
}
int f = -1;
for (int i = 1; i <= n; i++) {
if (i + mx <= n && i + mn >= 1) {
if (f != -1) {
cout << -1 << '\n';
return 0;
}
f = i;
}
}
vector<int> a(n);
a[0] = f;
for (int i = 0; i < n - 1; i++) {
a[i + 1] = a[i] + d[i];
}
for (int i = 0; i < n; i++) {
cout << a[i] << ' ';
}
cout << '\n';
return 0;
}
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