#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef pair <ll, ll> pii; #define fi first #define se second #define pb push_back const int MOD = 1e9; const int MAX = 3e5 + 5; const int dx[4] = {0, 0, 1, -1}; const int dy[4] = {1, -1, 0, 0}; #define int ll signed main(){ ios_base::sync_with_stdio(0); cin.tie(0); int n; cin >> n; int a[n + 5]; for(int i = 1 ; i < n ; i++)cin >> a[i]; int mx = 0, mn = 0; int cur = 0; vector <int> v;v.pb(0); for(int i = 1 ; i < n ; i++){ cur += a[i]; v.pb(cur); mx = max(mx, cur); mn = min(mn, cur); } if(mx - mn + 1 != n)cout << -1 << endl; else{ map <int, int> mp; for(int i = mn ; i <= mx ; i++)mp[i] = i - mn + 1; for(auto it : v)cout << mp[it] << ' '; cout << endl; } return 0; }