N = int(input())
A = list(map(int, input().split()))
used = [0] * N


def valid(a, b, c):
    return len(set([a, b, c])) == 3 and (min(a, b, c) == b or max(a, b, c) == b)


def win(depth):
    for a in range(N):
        for b in range(a + 1, N):
            for c in range(b + 1, N):
                if used[a] or used[b] or used[c] or not valid(A[a], A[b], A[c]):
                    continue
                used[a] = used[b] = used[c] = 1
                w = not win(depth + 1)
                used[a] = used[b] = used[c] = 0
                if w:
                    if depth == 0:
                        print(a, b, c)
                    return 1
    return 0


if not win(0):
    print(-1)