#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  long long int n;
  cin >> n;
  long long int c = (n * (n + 1)) / 2;
  long long int a[n - 1];
  long long int s = 0;
  for (long long int i = 0; i < n - 1; i++) {
    cin >> a[i];
    s = s + a[i];
    c = c - s;
  }
  long long int b = c / n;
  vector<long long int> v;
  v.push_back(b);
  long long int c2 = 0;
  set<long long int> s1;
  if (b > n || b < 1)
    cout << -1;
  else {
    s1.insert(b);
    for (long long int i = 0; i < n - 1; i++) {
      b = b + a[i];
      if (b > n || b < 1 || s1.count(b) == 1) {
        c2 = 1;
        cout << -1;
        break;
      }
      v.push_back(b);
      s1.insert(b);
    }
    if (c2 == 0)
      for (long long int i = 0; i < v.size(); i++) cout << v[i] << " ";
  }
  return 0;
}
