input: 
  import random
  import string
  
  def random_string(length: int) -> str:
      """
      Generate a random string of the given length using lowercase letters.
  
      >>> random_string(6)
      'aeqzlh'
      >>> random_string(6)
      'wdyfue'
      >>> random_string(6)
      'ghqaks'
      """
      letters = string.ascii_lowercase
      return ''.join(random.choice(letters) for i in range(length))
  
output:     letters = string.ascii_lowercase
      return ''.join(random.choice(letters) for i in range(length))