docs: def monotony(seq):
      """Determine the monotony of a sequence
  
      :param seq: a sequence
  
      :returns: 1 if the sequence is sorted (increasing)
      :returns: 0 if it is not sorted
      :returns: -1 if it is sorted in reverse order (decreasing)
  
      >>> monotony([1, 2, 3])
      1
      >>> monotony([1, 3, 2])
      0
      >>> monotony([3, 2, 1])
      -1
  
      """
      if seq == sorted(seq):
          return 1
      elif seq == list(reversed(sorted(seq))):
          return -1
      else:
          return 0