code: def list_snapshots_for_a_minute(path, cam_id, day, hourm):
      
      screenshoots_path = path+"/"+str(cam_id)+"/"+day+"/"+hourm
      if os.path.exists(screenshoots_path):
          screenshots = [scr for scr in sorted(os.listdir(screenshoots_path))]
          return screenshots
      else:
          return []
docs: Returns a list of screenshots