import math._

object Main {
  def isValid(a: Int, b: Int, c: Int): Boolean =
    return (a < b && b > c) || (a > b && b < c)

  def calc(turn: Int, xs: Array[Int]): Boolean = {
//    if (xs.length < 3) {
//      return turn % 2 == 1
//    }

    val ys = Array.fill(xs.length-3)(0)

    for (i <- 0 to xs.length-1) {
      for (j <- i+1 to xs.length-1) {
        for (k <- j+1 to xs.length-1) {
          if (isValid(xs(i), xs(j), xs(k))) {

            var p = 0
            for (m <- 0 to xs.length-1) {
              if (m != i && m != j && m != k) {
                ys(p) = xs(m)
                p += 1
              }
            }
            // println(s"take turn:$turn ${xs(i)} ${xs(j)} ${xs(k)}")

            val ret = calc(turn+1, ys)
            if (turn % 2 == 0) {
              if (ret) {
                if (turn == 0) {
                  println(s"$i $j $k")
                }
                return true
              }
            }
            else {
              if (!ret) return false
            }
          }
        }
      }
    }

    return turn % 2 == 1
  }

  def main(args: Array[String]) {
    val sc = new java.util.Scanner(System.in)
    val n = sc.nextInt
    val xs = Array.fill(n)(sc.nextInt)

    val win = calc(0, xs)
    if (!win) println(-1)
  }
}