package main
import "fmt"

func isKado(a, b, c int) bool {
	return (a - b) * (b - c) < 0 && a != c
}
var (
	used []bool
)

func recv(k []int, a, b, c int) bool {
	used[a] = true
	used[b] = true
	used[c] = true

	isWin := false
	N := len(k)
	for a := 0; a < N; a++ {
		if used[a] {
			continue
		}
		for b := a + 1; b < N; b++ {
			if used[b] {
				continue
			}
			for c := b + 1; c < N; c++ {
				if used[c] {
					continue
				}
				if !isKado(k[a], k[b], k[c]) {
					continue
				}
				isWin = isWin || !recv(k, a, b, c)
			}
		}
	}
	used[a] = false
	used[b] = false
	used[c] = false
	return isWin
}
func main() {
	var N int
	fmt.Scanf("%d", &N)
	var k = make([]int, N)
	used = make([]bool, N)
	for i := 0; i < N; i++ {
		fmt.Scanf("%d", &k[i])
	}
	for a := 0; a < N; a++ {
		for b := a + 1; b < N; b++ {
			for c := b + 1; c < N; c++ {
				if !isKado(k[a], k[b], k[c]) {
					continue
				}
				if !recv(k, a, b, c) {
					fmt.Println(a, b, c)
					return
				}
			}
		}
	}
	fmt.Println(-1)

}

//aのb乗をします O(log b)
func pow(a int, b int) int {
	total := 1
	tmp := a
	for b > 0 {
		if b % 2 == 1 {
			total *= tmp
		}
		b /= 2
		tmp *= tmp
	}
	return total
}