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;

    int[] K;
    private int N;

    private int I, J, L;

    private void Scan()
    {
        Cin = new Scanner(Console.OpenStandardInput());
        N = Cin.NextInt();
        K = Cin.IntArray();
    }
    public void Solve()
    {
        Scan();
        if (Win(0))
        {
            Console.WriteLine("{0} {1} {2}", I, J, L);
        }
        else
        {
            Console.WriteLine("-1");
        }

    }

    private bool Win(int x)
    {
        for (int i = 0; i < N - 2; i++) for (int j = i + 1; j < N - 1; j++) for (int l = j + 1; l < N; l++)
                {
                    if (((x & 1 << i) != 0) || ((x & 1 << j) != 0) || ((x & 1 << l) != 0)) continue;
                    if ((K[i] == K[j]) || (K[j] == K[l]) || K[i] == K[l]) continue;
                    if ((K[i] >= K[j]) && (K[j] >= K[l])) continue;
                    if ((K[i] <= K[j]) && (K[j] <= K[l])) continue;
                    int next = x | (1 << i) | (1 << j) | (1 << l);
                    if (Win(next)) continue;
                    I = i;
                    J = j;
                    L = l;
                    return true;
                }
        return false;
    }
}