#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#pragma GCC target ("avx2")
#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
#pragma GCC optimize("fast-math")
#define ll long long
#define ld long double
#define vi vector<ll>
#define endl "\n"
#define pr pair<ll, ll>
#define ff first
#define ss second
#define all(x) x.begin(), x.end()
const int mod = 1e9+7;
void _p(ll a){cout<<a<<endl;}
void _p(string a){cout<<a<<endl;}
void _p(ld a) {cout<<a<<endl;}
template <class T>
void _p(vector<T> a){for(T val:a)cout<<val<<" ";cout<<endl;}
#define debug(x) cout<<#x<<" -> ";_p(x)
typedef tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update > ordered_set;
vector<pr> move8 = {{1, 0}, {1, 1}, {0, 1}, {-1, 1}, {-1, 0}, {-1, -1}, {0, -1}, {1, -1}};
vector<pr> move4 = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};
vector<pr> move2 = {{0, 1}, {1, 0}};
// Segment tree (addition version)
struct Node { // *
ll val; bool upd;
Node() {val = 0; upd = false;}
};
Node _merge(Node a1, Node a2) { // *
Node ans;
ans.val = a1.val + a2.val;
return ans;
}
struct SegTree {
int n; vi a;
vector<Node> tree, lzy;
SegTree (const vi& inp) {
a = inp;
n = a.size();
tree.resize(4*n); lzy.resize(4*n);
}
void build (int id, int l, int r) {
if (l == r) {
tree[id].val = a[l]; // *
return;
}
ll mid = (l + r) >> 1;
build(2*id, l, mid);
build(2*id + 1, mid+1, r);
tree[id] = _merge(tree[2*id], tree[2*id + 1]);
}
void push(int id, int l, int r) {
if (!lzy[id].upd) return;
tree[id].val += (r - l + 1) * lzy[id].val; // * (assign or add)
if (l != r) {
lzy[2*id].val += lzy[id].val, lzy[2*id+1].val += lzy[id].val; // * (assign or add)
lzy[2*id].upd = true, lzy[2*id + 1].upd = true;
}
lzy[id].val = 0; lzy[id].upd = false;
}
Node query (int id, int l, int r, int L, int R) {
push(id, l, r);
if (L > r || l > R) return Node();
if (l >= L && r <= R) { return tree[id]; }
int mid = (l + r) >> 1;
return _merge(query(2*id, l, mid, L, R), query(2*id+1, mid+1, r, L, R));
}
void update(int id, int l, int r, int L, int R, ll V) {
push(id, l, r);
if (L > r || l > R) return;
if (l >= L && r <= R) {
lzy[id].val += V, lzy[id].upd = true; // * (assign or add)
push(id, l, r);
return;
}
int mid = (l + r) >> 1;
update(2*id, l, mid, L, R, V);
update(2*id + 1, mid+1, r, L, R, V);
tree[id] = _merge(tree[2*id], tree[2*id+1]);
}
// over-ridden functions
void build() {build(1, 0, n-1);}
Node query(int l, int r) {return query(1, 0, n-1, l, r);}
void update(int l, int r, ll V) { update(1, 0, n-1, l, r, V);}
};
void solution();
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
solution();
return 0;
}
void solution() {
ll n; cin >> n;
vi a(n-1);
for (ll &z : a) cin >> z;
vector<bool> currentState(n+1, 1);
currentState[0] = 0;
for (int i = 0; i < n-1; i++) {
vector<bool> nextState(n+1);
for (int j = 1; j <= n; j++) {
if (!currentState[j] || a[i] + j > n || a[i] + j < 1) continue;
nextState[a[i]+j] = true;
}
swap(currentState, nextState);
}
if (count(all(currentState), 1) != 1) {
cout << -1 << endl;
return;
}
vi ans(n);
for (int i = 1; i <= n; i++) {
if (currentState[i]) {ans[n-1] = i; break;}
}
for (int i = n-2; i >= 0; i--) {
ans[i] = ans[i+1] - a[i];
}
for (auto val : ans) cout << val << " ";
}
