#include<bits/stdc++.h>
using namespace std;
#define int long long
#define inf 5e18
#define nl '\n'
int n;
int ans[300001];
bool func(pair<int,int> a[], int v){
auto [x, ix] = *min_element(a, a+n-1);
ans[ix] = max(x+1, v);
ans[1] = ans[ix] - x;
if(ans[1] > n) return 0;
for(int i=0; i<n-1; i++){
auto [x, ix] = a[i];
ans[ix] = x + ans[1];
if(ans[ix] > n) return 0;
}
return 1;
}
inline void solve(){
cin>>n;
pair<int,int> a[n-1];
int pre = 0;
for(int i=0; i<n-1; i++){
int x;
cin>>x;
pre += x;
a[i] = {pre, i+2};
}
auto [x, ix] = *min_element(a, a+n-1);
if(x+1 >= 2 ? func(a, x+2) : func(a, 2)){
cout<<-1;
return;
}
func(a, 1);
for(int i=1; i<=n; i++) cout<<ans[i]<<" ";
}
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(NULL);cout.tie(NULL);
int t = 1;
//cin>>t;
while(t--) solve();
return 0;
}
