import copy

n = int(input())
k = [int(x) for x in input().split()]

def are_kadomatsu(x,y,z):
    if x == y or y == z or z == x:
        return False
    elif x < y < z or x > y > z:
        return False
    return True

def hand(num_list):
    num = len(num_list)
    hand_list = []
    for a in range(num):
        for b in range(a+1, num):
            for c in range(b+1, num):
                if are_kadomatsu(num_list[a], num_list[b], num_list[c]):
                    hand_list.append((a, b, c))
    return hand_list

def game(num_list):
    result = ()
    if hand(num_list):
        for (a,b,c) in hand(num_list):
            ls = copy.copy(num_list)
            ls.pop(a)
            ls.pop(b-1)
            ls.pop(c-2)
            if not hand(ls):
                result = (a,b,c)
                break
            else:
                for (a,b,c) in hand(ls):
                    ls2 = copy.copy(ls)
                    ls2.pop(a)
                    ls2.pop(b-1)
                    ls2.pop(c-2)
                    if not hand(ls2):
                        result = ()
                        break
                    else:
                        result = game(ls2)
    return result

if p:=game(k):
    a, b, c = p
    print(a, b, c)
else:
    print(-1)