import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

import itertools

N,*K = map(int,read().split())

def F(K):
    """勝てるなら、Trueとその初手
    負けるなら、Falseを返す"""
    for i,j,k in itertools.combinations(range(len(K)),3):
        is_kadomatsu = (K[i] > K[j] < K[k]) or (K[i] < K[j] > K[k])
        if not is_kadomatsu:
            continue
        newK = [x for ind,x in enumerate(K) if ind not in [i,j,k]]
        result = F(newK)
        if not result:
            return True, (i,j,k)
    return False

result = F(K)
if result:
    print(*result[1])
else:
    print(-1)