input: def generate_number() -> int:
      """ Generate a unique 6 digit number.
      >>> generate_number()
      45372
      >>> generate_number()
      82139
      """
      return random.randint(10000, 99999)
output:     
  import random
  
  def generate_number() -> int:
      """ Generate a unique 6 digit number.
      >>> generate_number()
      45372
      >>> generate_number()
      82139
      """
      return random.randint(10000, 99999)
  