#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 a[n + 1];
ll ans[n + 1];
bool cnt = 0;
fur(i, 1, n) {
bool valid = 1;
a[1] = i;
fur(j, 1, n - 1) {
a[j + 1] = a[1] + d[j];
if(a[j + 1] > n || a[j + 1] < 1)
valid = 0;
}
if(cnt && valid) {
cout << -1 << nl;
return 0;
} else if(valid) {
cnt = 1;
fur(i, 1, n)
ans[i] = a[i];
}
}
fur(i, 1, n)
cout << ans[i] << ' ';
}
