#include<bits/stdc++.h>
using namespace std;
#define Study ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define ll long long
#define ull unsigned long long
#define pb push_back
#define ff first
#define ss second
#define ins insert
#define all(x) x.begin(),x.end()
#define fori(x,y,z) for(ll x=y;x<=z;x++)
const ll INF=1e9;
const ll sz=2e5+10;
const ll mod=1e9+7;
void work(){
ll n;
cin>>n;
int mx=0;
vector<int> d(n-1,0);
int sum=0;
for(int i =0;i<n-1;i++){
cin>>d[i];
mx=max(mx , sum+=d[i]);
}
vector<int> arr;
int s=n - mx;
arr.pb(s);
int pref =s;
for(auto v:d){
pref+=v;
arr.pb(pref);
}
for(auto v:arr){
if(v<=0 && v>n){
cout<<"-1"<<endl;
return;
}
}
for(auto v:arr){
cout<<v<<" ";
}
cout<<endl;
}
int main(){
Study;
ll t=1;
//cin>>t;
while(t--){
work();
}
}
