input: from selenium import webdriver
  from selenium.webdriver.common.keys import Keys
  import time
  
  def automate_login(website_url: str, username_value: str, password_value: str) -> None:
      """ Automate the login process in a given website using Selenium. 
      The function will initialize a Chrome web driver, navigate to the target website,
      input the username and password, click the submit button, wait for the login process
      to complete, and then print 'Login successful!'.
      
      >>> automate_login('http://www.example.com', 'username', 'password')
      Login successful!
      """
output:     driver = webdriver.Chrome()
      driver.get(website_url)
      time.sleep(2)
  
      username = driver.find_element_by_name("username")
      password = driver.find_element_by_name("password")
  
      username.send_keys(username_value)
      password.send_keys(password_value)
  
      password.send_keys(Keys.RETURN)
      time.sleep(5)
  
      print('Login successful!')
      driver.quit()