input: 
  import random
  
  def generate_6_digit_number() -> int:
      """Generate a random 6-digit number.
      >>> generate_6_digit_number()
      456789
      >>> generate_6_digit_number()
      123456
      """
      return random.randint(100000, 999999)
  
output:     return random.randint(100000, 999999)