#include <iostream>
#include <vector>
#include <set>
#include <queue>

using namespace std;

int main()
{
    int n;
    cin >> n;
	vector<int> res(n);
	vector<int> input;
	int last = -1;
	int lPN = n;
	vector<set<int>> g(n);
	queue<int> q;
	for (size_t i = 0; i < n; i++)
	{
		int a;
		cin >> a;
		input.push_back(a);
		a--;
		if (a == -2) {
			q.push(i);
		}
		else {
			g[a].insert(i);
		}
	}
	while (!q.empty())
	{
		int index = q.front();
		q.pop();
		res[index] = lPN--;
		for (auto n : g[index]) {
			q.push(n);
		}
	}
	for (size_t i = 0; i < n; i++)
	{
		cout << res[i] << " ";
	}
}