#include <bits/stdc++.h>
using namespace std;

vector<bool> volt;

int main() {
        cin.tie(0); cout.tie(0); ios::sync_with_stdio(0);
	int n;
	cin >> n;
	vector<int> sor(n);
	for (int i = 0; i < n; i++) {
		cin >> sor[i];
	}
	int legk = 1;
	int legn = n;
	volt.resize(n);
	vector<int> mo(n);
	for (int i = 0; i < n; i++) {
		if (sor[i] == -1) {
			mo[i] = legn;
			legn--;
		} else {
			mo[i] = legk + sor[i] - i - 2;
			volt[mo[i]] = 1;
			if (mo[i] == legk) {
				legk++;
				while (volt[legk] == 1) {
					legk++;
				}
			}
		}
		cout << mo[i] << " ";
	}
}