using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        new Magatro().Solve();
    }
}

public class Scanner
{
    private StreamReader Sr;

    private string[] S;
    private int Index;
    private const char Separator = ' ';

    public Scanner(Stream source)
    {
        Index = 0;
        S = new string[0];
        Sr = new StreamReader(source);
    }

    private string[] Line()
    {
        return Sr.ReadLine().Split(Separator);
    }

    public string Next()
    {
        string result;
        if (Index >= S.Length)
        {
            S = Line();
            Index = 0;
        }
        result = S[Index];
        Index++;
        return result;
    }
    public int NextInt()
    {
        return int.Parse(Next());
    }
    public double NextDouble()
    {
        return double.Parse(Next());
    }
    public long NextLong()
    {
        return long.Parse(Next());
    }
    public decimal NextDecimal()
    {
        return decimal.Parse(Next());
    }
    public string[] StringArray(int index = 0)
    {
        Next();
        Index = S.Length;
        return S.Skip(index).ToArray();
    }
    public int[] IntArray(int index = 0)
    {
        return StringArray(index).Select(int.Parse).ToArray();
    }
    public long[] LongArray(int index = 0)
    {
        return StringArray(index).Select(long.Parse).ToArray();
    }
    public bool EndOfStream
    {
        get { return Sr.EndOfStream; }
    }
}


class Magatro
{
    private int N;
    private int[] A;

    public void Solve()
    {
        Scanner scanner = new Scanner(Console.OpenStandardInput());
        N = scanner.NextInt();
        A = new int[N];
       for(int i = 0; i < N; i++)
        {
            A[i] = scanner.NextInt();
        }
        if (A.Count(i => i == A[0]) == N&&A[0]<N)
        {
            Console.WriteLine(-1);
            return;
        }
        var ans = (new int[N]).Select((i, index) => index).ToArray();

        for(int i = 0; i < N; i++)
        {
            if(ans[i] == A[i])
            {
                for(int j = 0; j < N; j++)
                {
                    if (i == j) continue;

                    if (ans[j] != A[i] && ans[i] != A[j])
                    {
                        int t = ans[j];
                        ans[j] = ans[i];
                        ans[i] = t;
                    }
                }
            }
        }

        foreach(int i in ans)
        {
            Console.WriteLine(i);
        }
    }
}