text: # vowel substring
  
  
  def vowel(string):
      vowels = "aeiou"
      res = []
      temp_str = ""
      res_str = ""
      for el in string:
          if el in vowels:
              temp_str += el
          else:
              res_str = max(temp_str, res_str)
      res_str = max(temp_str, res_str)
  
      return len()
  
      # count = 0
      # max_count = 0
      # for el in string:
      #     if el in vowels:
      #         count += 1
      #     else:
      #         count = 0
      #     if count > max_count:
      #         max_count = count
  
      # return max_count
  
  
  print(vowel("cuaieuouac"))
  