class Lister(size: Int) {
  private val list: List[Int] = createList(size)
  private def createList(size: Int): List[Int] =
    if (size < 1) Nil
    else if (size % 2 != 0) (size :: createList(size - 1)).reverse
    else size :: (createList(size - 1).reverse)
  override def toString: String = toString(list)
  private def toString(list: List[Int]): String = list match {
    case Nil => ""
    case first :: Nil => first.toString
    case first :: remained => first + "-" + toString(remained)
  }
}

for (arg <- args)
  for (size <- 1 to arg.toInt)
    println(new Lister(size))