#include <bits/stdc++.h>
using namespace std;
#define int long long
#define rep(i,a,b) for(int i=a;i<=b;++i)
#define per(i,a,b) for(int i=a;i>=b;--i)
#define pb push_back
const int MAXN=3e5 + 10;
int a[MAXN], l[MAXN], r[MAXN], b[MAXN];
int32_t main(){
ios::sync_with_stdio(0);cin.tie(0);
int n;cin >> n;
rep(i,1,n-1) cin >> a[i];
rep(i,1,n) l[i] = 1, r[i] = n;
rep(i,1,n-1) {
if (a[i] >= 0) {
r[i] = min(r[i], n-a[i]);
l[i+1] = max(l[i+1], a[i]+1);
} else {
r[i+1] = min(r[i+1], n+a[i]);
l[i] = max(l[i], -a[i]+1);
}
}
bool ok = 0;
rep(i, 1, n) {
if (l[i] == r[i]) ok = 1, b[i] = l[i];
if (l[i] > r[i]) {
ok = 0;
break;
}
}
if (!ok) {
cout << "-1\n";
return 0;
}
rep(i,2,n) if (b[i-1]) b[i] = a[i-1] + b[i-1];
per(i,n-1,1) if (b[i+1]) b[i] = b[i+1] - a[i];
rep(i,1,n) cout << b[i] << " \n"[i==n];
return 0;
}
