from itertools import combinations

N = int(input())
K = list(map(int, input().split()))
dp = [False]*(1<<N)

for S in range((1<<N)-1, -1, -1):
    idx = []
    
    for i in range(N):
        if not (S>>i)&1:
            idx.append(i)

    for a, b, c in combinations(idx, 3):
        if (K[a]<K[b] and K[b]>K[c]) or (K[a]>K[b] and K[b]<K[c]):
            S_ = S
            S_ |= 1<<a
            S_ |= 1<<b
            S_ |= 1<<c
            dp[S] |= not dp[S_]
    
for a, b, c in combinations(range(N), 3):
    S = 0
    S |= 1<<a
    S |= 1<<b
    S |= 1<<c
    
    if ((K[a]<K[b] and K[b]>K[c]) or (K[a]>K[b] and K[b]<K[c])) and not dp[S]:
        print(a, b, c)
        exit()
    
print(-1)