alphabetical order checking script

import pyperclip, time, sys, re

# Every second, checks to make sure the contents of the clipboard are in
# alphabetical order. I'm using this to check if the index I'm writing is in
# alphabetical order, which is tricky since it has sub-entries which are out
# of order relative to the main entries.

while True:
    entries = [x.strip().lower() for x in pyperclip.paste().split('\n') if x.strip() != '']
    entries = [re.sub('[^a-z ]', '', x) for x in entries] # remove non-letter
    sortedEntries = sorted(entries)

    if entries == sortedEntries:
        print('Ok')
    else:
        print('Out of order:\n', '\n'.join(entries))
        print()
        print('Should be:\n', '\n'.join(sortedEntries))
        sys.exit()
    time.sleep(1)