#include <iostream>
#include <iomanip>
#include <vector>
#include <cmath>
#include <algorithm>
#include <set>
#include <queue>
#include <map>
#include <stack>
#include <bitset>
#include <string>
#include <cstring>
#include <iterator>
#include <random>
#define ll long long
#define ld long double
#define inf (ll)(2*1e18)
#define sort(a) sort(a.begin(), a.end())
#define reverse(a) reverse(a.begin(), a.end())
#define pb push_back
#define endl "\n"
using namespace std;
void solve(){
ll n, i, m, m2;
cin>>n;
vector<ll> a(n);
vector<ll> d(n-1);
for(i=0;i<n-1;++i){
cin>>d[i];
}
a[0] = 1;
m = 1;
m2 = 1;
for(i=0;i<n-1;++i){
a[i+1] = a[i] + d[i];
m = max(a[i+1], m);
m2 = min(a[i+1], m2);
}
if(m - m2 + 1 == n){
for(auto el: a){
cout<<el-m2+1<<' ';
}
cout<<endl;
return;
}
cout<<-1<<endl;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
srand(time(nullptr));
ll t=1;
// cin>>t;
for(;t>0;--t){
solve();
}
return 0;
}
