#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define ii pair<int, int>
#define fi first
#define se second
#define all(a) a.begin(), a.end()
#define int ll
using namespace std;
const int N = 3e5+5;
const int mod = 1e9+7;
const int inf = 2e9;
void solve()
{
int n;
cin>>n;
vector<int> a(n, 0);
for (int i = 1; i < n; i++) cin>>a[i];
for (int i = 2; i < n; i++) a[i] += a[i-1];
int mx = -inf, mn = inf;
for (int i = 1; i < n; i++) mx = max(mx, a[i]), mn = min(mn, a[i]);
int cnt = 0, ss = -1;
for (int st = 1; st <= n; st++)
{
if (st + mx <= n && st + mn >= 1) cnt++, ss = st;
}
if (!cnt || cnt > 1)
{
cout<<"-1";
return;
}
for (int i = 0; i < n; i++)
{
cout<<ss + a[i]<<" ";
}
}
signed main()
{
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
// freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
solve();
}
