#include <iostream>
#include <vector>
#include <cstring>
#include <string>
#include <algorithm>
#include <iomanip>
#include <cmath>
#include <cassert>
using namespace std;

struct BipartiteMatching {
	int V;
	vector<vector<bool> > G;
	vector<int> match;
	vector<bool> used;

	BipartiteMatching(int v) {
		V = v;
		G = vector<vector<bool> >(v, vector<bool>(v));
		match = vector<int>(v);
		used = vector<bool>(v);
	}

	void add_edge(int v, int u) {
		G[v][u] = G[u][v] = true;
	}

	bool dfs(int v) {
		used[v] = true;
		for(int i = 0; i < V; i++) {
			if(!G[v][i]) continue;
			int u = i, w = match[u];
			if(w < 0 || (!used[w] && dfs(w))) {
				match[v] = u;
				match[u] = v;
				return true;
			}
		}
		return false;
	}

	int calc() {
		int res = 0;
		fill(match.begin(), match.end(), -1);
		for(int v = 0; v < V; v++) {
			if(match[v] < 0) {
				fill(used.begin(), used.end(), false);
				if(dfs(v)) {
					res++;
				}
			}
		}
		return res;
	}
};


int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int N;
	cin >> N;

	BipartiteMatching bp(2 * 50);
	for(int i = 0; i < N; i++) {
		int a;
		cin >> a;
		for(int j = 0; j < N; j++) {
			if(a == j) continue;
			bp.add_edge(i, 50 + j);
		}
	}

	if(bp.calc() != N) {
		cout << -1 << endl;
	}
	else {
		for(int i = 0; i < N; i++) {
			cout << bp.match[i] - 50 << endl;
		}
	}
}