input: 
  def extract_trending_videos(page_url: str) -> None:
      """ Scrape and print the top ten trending YouTube video titles from the given page URL.
      >>> extract_trending_videos("https://www.youtube.com/feed/trending")
      Top ten trending YouTube video titles
      """
      import requests
      from bs4 import BeautifulSoup
  
      # make a request to get the page content
      page = requests.get(page_url)
  
      # parse the page content
      soup = BeautifulSoup(page.content, 'html.parser')
  
      # extract the list of trending videos
      trending_videos = soup.find_all(class_='expanded-shelf-content-item-wrapper')
  
      # print the top ten trending videos
      for video in trending_videos[:10]:
          print(video.find(class_='yt-uix-tile-link').get('title'))
  
output:     print("Top ten trending YouTube video titles")