#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define fi first
#define se second
const int N = 3e5+5;
int n,ans[N],d[N],pre[N];
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> n;
for(int i = 2; i <= n; i++){
cin >> d[i];
pre[i] = pre[i-1]+d[i];
}
int mn = 1e18;
int mx = -1e18;
for(int i = 1; i <= n; i++){
mn = min(mn,pre[i]);
mx = max(mx,pre[i]);
}
if(mx-mn == n-1){
for(int i = 1; i <= n; i++) cout << pre[i]+n-mx << " ";
return 0;
}
cout << -1;
}
