input: from typing import List
  
  def generate_random_string(length: int) -> str:
      """Generate a random string of given length with characters from 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'.
      
      >>> generate_random_string(10)
      'aB3dEfGhI2' # Example output, actual output will be random
      >>> generate_random_string(5)
      '1zYxW' # Example output, actual output will be random
      """
output:     import random
      import string
      
      characters = string.ascii_letters + string.digits
      return ''.join(random.choice(characters) for _ in range(length))