#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vb = vector<bool>;
using vvb = vector<vb>;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vc = vector<char>;
using vvc = vector<vc>;
using vs = vector<string>;
const ll mod = 1e9 + 7,inf = 1e18;
#define pb push_back
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
void setIO()
{
fast;
}
int main()
{
setIO();
int n;
cin>>n;
vl sums(n + 1);
for (int i = 1;i<n;i++)cin>>sums[i],sums[i] += sums[i - 1];
ll mn = sums[1],mx = sums[1];
for (int i = 2;i<n;i++)mn = min(sums[i],mn),mx = max(sums[i],mx);
int cnt = 0,posi = -1;
for (int i = 1;i<=n;i++){
if (1 <= mn + i && mn + i <= n && 1 <= mx + i && mx + i <= n)
cnt++,posi = i;
}
if (cnt != 1)cout<<-1;
else{
cout<<posi<<" ";
for (int i = 1;i<n;i++)cout<<sums[i] + posi<<" ";
}
return 0;
}
