# include <bits/stdc++.h>
using namespace std;
typedef long long ll; 
# define int long long
# define lc u << 1
# define rc u << 1 | 1
# define fi first
# define se second
const int N = 25;

int n;
int a[N];
int x, y, z;
bool dfs (int S)
{
	for (int i = 0; i < n; i ++ )
	{
		for (int j = i + 1; j < n; j ++ )
		{
			for (int k = j + 1; k < n; k ++ )
			{
				if (~S & (1 << i) && ~S & (1 << j) && ~S & (1 << k))
				{
					if ((a[i] > a[j] && a[j] < a[k] && a[i] != a[k]) || (a[i] < a[j] && a[j] > a[k] && a[i] != a[k]))
					{
						if (!dfs (S ^ (1 << i) ^ (1 << j) ^ (1 << k))) 
						{
							x = i, y = j, z = k;
							return 1;
						}
					}
				}
			}
		}
	}
	return 0;
}
signed main ()
{
//	freopen ("game.in", "r", stdin); freopen ("game.out", "w", stdout);
	scanf ("%lld", &n);
	for (int i = 0; i < n; i ++ ) scanf ("%lld", &a[i]);
	if (dfs (0)) printf ("%lld %lld %lld\n", x, y, z);
	else printf ("-1\n");
	return 0;
}