#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
#define sadd(a, b) a = Add(a, b)
#define smul(a, b) a = Mul(a, b)
using namespace std;
const int N = 1e3 + 2;
const int mod = 1e9 + 7;
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int n;
cin >> n;
vector<ll> a(n - 1);
for (int i = 0; i < n - 1; i++) {
cin >> a[i];
if (i > 0) a[i] += a[i - 1];
}
ll mn = *min_element(a.begin(), a.end());
ll mx = *max_element(a.begin(), a.end());
ll y = 1 - mn; ll x = n - mx;
smin(x, (ll)n); smax(x, 1ll);
smin(y, (ll)n); smax(y, 1ll);
if (x != y) {
cout << -1 << en;
return 0;
}
vector<ll> ans(n);
ans[0] = x;
for (int i = 0; i < n - 1; i++) {
ans[i + 1] = ans[0] + a[i];
}
for (int i = 0; i < n; i++) cout << ans[i] << sp;
cout << en;
return 0;
}
