#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>
#include <set>

using namespace std;

int main() {
	int n;

	cin >> n;
	vector<int> a(n, 0);
	set<int> nums;
	for (int i = 0; i < n; i++) {
		cin >> a[i];
		nums.insert(a[i]);
	}

	if (nums.size() == 1 && a[0] < n) {
		cout << -1 << endl;
		return 0;
	}

	vector<int> s(n);
	for (int i = 0; i < n; i++) {
		s[i] = i;
	}

	bool ok;
	while(1) {
		ok = true;
		for (int i = 0; i < n; i++) {
			if (s[i] == a[i]) {
				ok = false;
				break;
			}
		}
		if (ok) {
			break;
		}
		random_shuffle(s.begin(), s.end());
	}

	for (int i = 0; i < n; i++) {
		cout << s[i] << endl;
	}

	return 0;
}