#include<bits/stdc++.h>
#include<iostream>
#include<vector>
#include<map>
#include<set>
#include<bitset>
#define int long long
#define spc <<" "<<
#define vi vector<int>
#define pii pair<int,int>
#define vpii vector<pair<int,int>>
#define dfab int a,b;cin>>a>>b;
#define dfa int a;cin>>a;
#define ff first
#define ss second
#define pb push_back
#define dfoutput if(cvp){cout<<"YES\n";}else{cout<<"NO\n";}
#define dfnarr int n;cin>>n;int arr[n];for(int i=0;i<n;i++){cin>>arr[i];}
#define mod 1000000007
#define mod2 998244353
#define inf 1e18
#define N 1e5+10
#define C 1e9+10
#define all(x) x.begin(),x.end()
using namespace std;
void solve() {
int n;cin>>n;
int arr[n-1];
int b=0,l=0,c=0;
for(int i=0;i<n-1;i++){
cin>>arr[i];
c+=arr[i];
b=max(b,c);
l=min(l,c);
}
if(b-l==n-1){
c=abs(l)+1;
cout<<c<<" ";
for(int i=0;i<n-1;i++){
c+=arr[i];
cout<<c<<" ";
}
return;
}
cout<<-1;
}
signed main(){
int t=1;
//cin>>t;
while(t--){
solve();
}
}
