input: def generate_string(string_length: int) -> str:
      """Generate a random string of a specified length.
      >>> generate_string(10)
      'aBcDeFgHiJ' # Example output, actual output will vary
      """
output:     import random
      import string
      
      return ''.join(random.choice(string.ascii_letters) for _ in range(string_length))