text: ALPHABET = {
      '0': 'zero',
      '1': 'one',
      '2': 'two',
      '3': 'tree',
      '4': 'fower',
      '5': 'fife',
      '6': 'six',
      '7': 'seven',
      '8': 'ait',
      '9': 'niner',
      '-': 'minus',
      '.': 'and',
  }
  
  
  def aviation_numbers(number):
      output = []
  
      for char in str(number):
          output.append(ALPHABET[char])
  
      return ' '.join(output)
  
  
  def aviation_numbers(number):
      """
      >>> aviation_numbers(1969)
      'one niner six niner'
      >>> aviation_numbers(31337)
      'tree one tree tree seven'
      """
      return ' '.join(ALPHABET[x] for x in str(number))
  
  
  if __name__ == '__main__':
      out = aviation_numbers(1969)  # 'one niner six niner'
      print(out)
  
      out = aviation_numbers(31337)  # 'tree one tree tree seven'
      print(out)
  
      out = aviation_numbers(13.37)  # 'one tree and tree seven'
      print(out)
  
      out = aviation_numbers(31.337)  # 'tree one and tree tree seven'
      print(out)
  
      out = aviation_numbers(-1969)  # 'minus one niner six niner'
      print(out)
  
      out = aviation_numbers(-31.337)  # 'minus tree one and tree tree seven
      print(out)
  
      out = aviation_numbers(-49.35)  # 'minus fower niner and tree fife'
      print(out)
  
  