#include <bits/stdc++.h>
using namespace std;
#define int long long
int32_t main() {
int length;
cin >> length;
int arr[length-1];
for(int i=0; i<length-1; ++i) cin >> arr[i];
int mini=999999999, maxi=0, curr=0;
for(auto elem:arr) {curr+=elem; mini=min(mini, curr); maxi=max(maxi, curr);}
if(maxi-min(mini, (int) 0)==length-1) {
int ans[length];
ans[0]=abs(min(mini, (int) 0))+1;
for(int i=1; i<length; ++i) ans[i]=ans[i-1]+arr[i-1];
for(auto elem:ans) cout << elem << " ";
}
else cout << -1;
return 0;
}
