#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main() {
//your code goes here
int n;
cin >> n;
vector <int> arr = {};
for(int i = 1; i < n; i++) {
int num;
cin >> num;
arr.push_back(num);
}
vector <int> pref = {0};
int cur = 0;
for(int i = 0; i < n-1; i++) {
cur += arr[i];
// cout << cur << endl;
pref.push_back(cur);
}
int minv = 1e18;
int maxv = 0;
for(int i = 0; i < n; i++) {
// cout << pref[i] << endl;
maxv = max(maxv, pref[i]);
minv = min(minv, pref[i]);
}
int ans = 0;
int ch = -1;
for(int i = 1; i <= n; i++) {
if((maxv+i) <= n && (i+minv) >= 1) {
ans++;
ch = i;
}
}
// cout << ans << " " << maxv << " " << minv << endl;
if(ans > 1) {
cout << -1 << endl;
} else {
vector <int> ans = {};
for(int i = 0; i < n; i++) {
ans.push_back((ch+pref[i]));
}
for(int i = 0; i < n; i++) {
cout << ans[i] << " ";
}
cout << endl;
}
return 0;
}
