input: 
  def min_max(numbers: List[int]) -> List[int]:
      """Given an array of numbers, return an array containing the smallest and greatest numbers.
      >>> min_max([3, 4, 2, 8, 15, 6])
      [2, 15]
      >>> min_max([1, 2, 3, 4, 5])
      [1, 5]
      """
      return [min(numbers), max(numbers)]
  
output:     return [min(numbers), max(numbers)]