#include <bits/stdc++.h>
#define FAST_IO ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr)
#define setIO(i, o) freopen(i, "r", stdin), freopen(o, "w", stdout)
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) (int) (x).size()
#define lc(i) 2*i
#define rc(i) 2*i+1
//#define int long long
using namespace std;
using ll = long long;
using ii = pair<int, int>;
using vii = vector<ii>;
using vi = vector<int>;
using vvi = vector<vi>;
using vb = vector<bool>;
using vvb = vector<vb>;
const int N = 3e5 + 5, MOD = 1e9 + 7, INF = 1e9 + 5;
int n;
int a[N];
bool check(int x) {
for (int i = 1; i < n; i++) {
x = x + a[i - 1];
if (x > n) return false;
}
return true;
}
signed main() {
FAST_IO;
#ifdef arujbansal_local
setIO("input.txt", "output.txt");
#endif
cin >> n;
for (int i = 0; i < n - 1; i++) cin >> a[i];
int lo = 1, hi = n, ans = -1;
while (lo <= hi) {
int mid = (lo + hi) >> 1;
if (check(mid)) {
ans = max(ans, mid);
lo = mid + 1;
} else hi = mid - 1;
}
vi seq(n);
seq[0] = ans;
bool one = (seq[0] == 1);
for (int i = 1; i < n; i++) {
seq[i] = seq[i - 1] + a[i - 1];
if (seq[i] == 1) one = true;
}
if (one)
for (const auto &x : seq) cout << x << " ";
else cout << -1;
}
