#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], b[MAXN], ans[MAXN];
int32_t main(){
ios::sync_with_stdio(0);cin.tie(0);
int n;cin >> n;
rep(i,2,n) cin >> a[i];
int cnt = 0;
rep(i,1,n) {
b[1] = i;
rep(i,2,n) b[i] = b[i-1]+a[i];
bool ok = 1;
rep(i,1,n) if (b[i] < 1 || b[i] > n) ok = 0;
cnt += ok;
if (ok) rep(i,1,n) ans[i] = b[i];
}
if (cnt != 1) {
cout << "-1\n";
return 0;
}
rep(i,1,n) cout << ans[i] << " \n"[i==n];
return 0;
}
