#include <bits/extc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
#define int long long
#define f first
#define s second
#define all(x) x.begin(), x.end()
#define debug(x) do{auto y = x; cout << #x << " = " << y << endl;}while(0)
// #define endl "\n"
#define unordered_map __gnu_pbds::gp_hash_table
using pii = pair<int, int>;
const int inf = 1ll << 60;
const int MOD = 1e9 + 7;
signed main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
int n; cin >> n;
vector<int> d(n - 1);
for(int i = 0; i < n - 1; i++) {
cin >> d[i];
}
vector<int> r(n);
for(int i = 0; i < n - 1; i++) {
r[i + 1] = r[i] + d[i];
}
int m = *min_element(all(r));
for(int i = 0; i < n; i++) {
r[i] -= m;
}
if(*max_element(all(r)) == n - 1) {
for(auto x : r) {
cout << x + 1 << " ";
}
cout << endl;
} else {
cout << -1 << endl;
}
}
