#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pi = pair<int, int>;
using pl = pair<long long, long long>;
using vi = vector<int>;
using vl = vector<long long>;
using vpi = vector<pair<int, int>>;
using vpl = vector<pair<long long, long long>>;
#define fur(i, a, b) for(ll i = a; i <= (ll)b; ++i)
#define ruf(i, a, b) for(ll i = a; i >= (ll)b; --i)
#define fr first
#define sc second
#define mp make_pair
#define pb emplace_back
#define nl "\n"
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
ll n;
cin >> n;
ll d[n];
fur(i, 1, n) {
cin >> d[i];
}
fur(i, 2, n)
d[i] += d[i - 1];
ll mx = d[1], mn = d[1];
fur(i, 2, n - 1) {
mx = max(mx, d[i]);
mn = min(mn, d[i]);
}
ll least = 1 - mn;
ll most = n - mx;
least = max(least, 1ll);
most = min(most, n);
if(least != most) {
cout << -1 << nl;
return 0;
}
cout << least << ' ';
fur(i, 1, n - 1)
cout << least + d[i] << ' ';
}
