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; }
    }
}

public class Magatro
{
    private Scanner Cin;

    List<int> K;
    private int N;


    private void Scan()
    {
        Cin = new Scanner(Console.OpenStandardInput());
        N = Cin.NextInt();
        K = Cin.IntArray().ToList();
    }
    public void Solve()
    {
        Scan();
        for (int i = 0; i < K.Count - 2; i++)
        {
            for (int j = i + 1; j < K.Count - 1; j++)
            {
                for (int k = j + 1; k < K.Count; k++)
                {
                    if (((K[i] <= K[j]) && (K[j] <= K[k])) || ((K[i] >= K[j]) && (K[j] >= K[k])))
                    {
                        continue;
                    }
                    var copy = K.ToList();
                    copy.RemoveAt(i);
                    copy.RemoveAt(j-1);
                    copy.RemoveAt(k-2);
                    //Console.WriteLine("{0} {1} {2}", i, j, k);
                    if (!Win(copy))
                    {
                        Console.WriteLine("{0} {1} {2}", i, j, k);
                        return;
                    }
                }
            }
        }
        Console.WriteLine(-1);
    }

    private bool Win(List<int> l)
    {
        bool result = true;
        bool flag = false;
        if (l.Count < 3)
        {
            return false;
        }
        for (int i = 0; i < l.Count - 2; i++)
        {
            for (int j = i + 1; j < l.Count - 1; j++)
            {
                for (int k = j + 1; k < l.Count; k++)
                {
                    if (((l[i] <= l[j]) && (l[j] <= l[k])) || ((l[i] >= l[j]) && (l[j] >= l[k]))||(l[i]==l[k]))
                    {
                        continue;
                    }
                    var copy = l.ToList();
                    copy.RemoveAt(i);
                    copy.RemoveAt(j-1);
                    copy.RemoveAt(k-2);
                    Console.WriteLine(string.Join(" ",copy));
                    flag = true;
                    result &= !Win(copy);
                }
            }
        }
        if (!flag) return false;
        return result;
    }
}