input: import random
  
  def generate_random_string(string_length: int) -> str:
      """ Generate a random string of the specified length using alphanumeric characters.
      >>> generate_random_string(10)
      'aB3dF7G8h9'
      >>> generate_random_string(5)
      '1XzY2'
      """
      random_characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
      random_string = ''.join(random.choices(random_characters, k=string_length))
      return random_string
output:     random_characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
      random_string = ''.join(random.choices(random_characters, k=string_length))
      return random_string