#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef pair<ull, ull> pull;
typedef pair<ll, ll> pii;
typedef pair<ld, ld> pld;
ll n, a[300009];
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
//freopen("in.txt", "r", stdin);
//freopen("out.txt", "w", stdout);
cin >> n;
for(ll i = 0; i < n-1; ++i)
cin >> a[i];
ll cur = 0, mini = 0, maxi = 0;
for(ll i = 0; i < n-1; ++i){
cur += a[i];
mini = min(mini, cur);
maxi = max(maxi, cur);
}
if(maxi-mini == n-1){
ll cur = n-maxi;
cout << cur << '\n';
for(ll i = 0; i < n-1; ++i){
cur += a[i];
cout << cur << '\n';
}
}
else
cout << "-1\n";
}
