input: 
  import string
  import random
  
  def generate_random_string(length: int = 8) -> str:
      """ Generate a random string of given length made of uppercase letters and numbers.
      >>> generate_random_string()
      'A1B2C3D4'  # Example output, not actual random output
      """
      chars = string.ascii_uppercase + string.digits
      return ''.join(random.choice(chars) for _ in range(length))
  
output:     chars = string.ascii_uppercase + string.digits
      return ''.join(random.choice(chars) for _ in range(length))