input: 
  import random
  
  def generate_random_number() -> str:
      """ Generate a random 6-digit number and return it as a string.
      >>> generate_random_number()
      '123456'
      >>> generate_random_number()
      '987654'
      """
      number = str(random.randint(100000, 999999))
      return number
  
output:     number = str(random.randint(100000, 999999))
      return number