#include <bits/stdc++.h>
using namespace std ;
const int MAX = 3e5 + 10 ;
int arr[MAX] ;
int n ;
int main()
{
ios_base::sync_with_stdio(0) ;
cin.tie(0) ;
cin>>n ;
for(int i = 0 ; i < n-1 ; ++i)
cin>>arr[i] ;
int Max = 0 , Min = 0 , sum = 0 ;
for(int i = 0 ; i < n-1 ; ++i)
{
sum += arr[i] ;
if(abs(sum) >= n)
return cout<<-1<<"\n" , 0 ;
if(sum > 0)
Max = max(Max , sum) ;
else
Min = max(Min , abs(sum)) ;
}
if(Max + Min != n-1)
return cout<<-1<<"\n" , 0 ;
int now = n-Max ;
cout<<now<<" " ;
for(int i = 0 ; i < n-1 ; ++i)
{
now += arr[i] ;
cout<<now<<" " ;
}
cout<<"\n" ;
return 0 ;
}
