#include <iostream>
#include <vector>
#include <string>

using namespace std;

typedef long long LL;

bool reassign(vector<int>& assign, vector<int>& deny, vector<int>& memo, int i){
    int N = assign.size();
    if(assign[i] == deny[i]){
        memo[i] = 1;
        for(int j = 0; j < N; j++){
            if(memo[j]) continue;
            swap(assign[i], assign[j]);
            if(reassign(assign, deny, memo, j)) return true;
        }
        return false;
    }
    return true;
}

int main(){
    int N;
    cin >> N;
    vector<int> assign(N);
    vector<int> deny(N);
    for(int i = 0; i < N; i++){
        cin >> deny[i];
        assign[i] = i;
    }
    for(int i = 0; i < N; i++){
        vector<int> memo(N);
        if(!reassign(assign, deny, memo, i)){
            cout << -1 << endl;
            return 0;
        }
    }
    for(int i = 0; i < N; i++){
        cout << assign[i] << endl;
    }

    return 0;
}