input: from selenium import webdriver
  from selenium.webdriver.common.keys import Keys
  import time
  
  def automate_login(target_url: str) -> None:
      """Automate the login process on a specified website using Selenium.
      The function initializes a web driver, navigates to the website, fills
      in the login credentials, and submits the form. After waiting for the
      login process to complete, it prints a success message.
      
      Example:
      automate_login('http://www.example.com')
      Expected output in terminal:
      Login successful!
      """
output:     driver = webdriver.Chrome()
      driver.get(target_url)
      time.sleep(2)
  
      username = driver.find_element_by_name("username")
      password = driver.find_element_by_name("password")
  
      username.send_keys("your_username")
      password.send_keys("your_password")
  
      password.send_keys(Keys.RETURN)
      time.sleep(5)
  
      print("Login successful!")
      driver.quit()