input: def selenium_login_automation(url: str, username_field: str, password_field: str, username: str, password: str, submit_button_field: str) -> str:
      """Automates the login process on a given website using Selenium.
      The function initializes a Chrome web driver, navigates to the provided URL, enters the username and password into the specified fields, 
      clicks the submit button, waits for the login process to complete, and then prints a success message.
  
      Example:
      >>> selenium_login_automation('http://www.example.com', 'username', 'password', 'my_username', 'my_password', 'submit')
      'Login successful!'
      """
output:     
      from selenium import webdriver
      from selenium.webdriver.common.by import By
      from selenium.webdriver.common.keys import Keys
      import time
  
      driver = webdriver.Chrome()
      driver.get(url)
  
      username_input = driver.find_element(By.NAME, username_field)
      password_input = driver.find_element(By.NAME, password_field)
      submit_button = driver.find_element(By.NAME, submit_button_field)
  
      username_input.send_keys(username)
      password_input.send_keys(password)
      submit_button.click()
  
      time.sleep(5)  # Wait for the login process to complete
  
      success_message = 'Login successful!'
      print(success_message)
      driver.quit()
      return success_message
  