#include<bits/stdc++.h>
#define int long long
#define ff first
#define ss second
#define pb push_back
using namespace std;
const int inf = 1e9;
struct DSU{
int n;
vector<int> p;
DSU(int size){
n = size;
p.resize(n);
for(int i = 0; i < n; i++){
p[i] = i;
}
}
int find(int u){
if(u == p[u]) return u;
return p[u] = p[find(u)];
}
void unite(int u, int v){
int a = find(u);
int b = find(v);
if(a != b){
p[a] = b;
}
}
};
signed main(){
int n;
cin >> n;
vector<int> d(n - 1);
int a[n - 1][n];
memset(a, 0, sizeof(a));
for(int i = 0; i < n - 1; i++){
cin >> d[i];
a[i][0] = i + 1;
}
int cur = 0;
for(int i = 0; i < n - 2; i++){
if(a[i] == a[i + 1] && a[i] == 0){
cur += 1;
}
}
if(cur == n - 2){
cout << "-1";
}
else{
for(int i = 0; i < n - 1; i++){
for(int j = 1; j < n; j++){
a[i][j] = a[i][j - 1] + d[j - 1];
}
}
vector<int> adj[n];
for(int i = 0; i < n - 1; i++){
for(int j = 0; j < n; j++){
if(a[i][j] >= 1 && a[i][j] <= n){
adj[i].push_back(a[i][j]);
}
}
}
for(int i = 0; i < n - 1; i++){
if(adj[i].size() == n){
for(auto v : adj[i]){
cout << v << " ";
}
}
return 0;
}
}
}
