Ah, I see.

Doesn't "The return of the function shall first be sorted by yymm, then by the name (which varies in length)." mean that you sort the list by the numbers, and if there are any ties, then sort by the length of the name?

In one of the tests, the input is ['aeb-1305', 'site-1305', 'play-1215', 'web-1304', 'site-1304', 'beb-1305'] and the expected output is ["play-1215", "site-1304", "web-1304", "aeb-1305", "beb-1305", "site-1305"]. Correct me if I'm mistaken, but shouldn't the output be ["play-1215", "web-1304", "site-1304", "aeb-1305", "beb-1305", "site-1305"] since web-1304 has the same number as site-1304 but web is a shorter word so it goes first? The error message is ['play-1215', 'web-1304', 'site-1304', 'aeb-1305', 'beb-1305', 'site-1305'] should equal ['play-1215', 'site-1304', 'web-1304', 'aeb-1305', 'beb-1305', 'site-1305']. (Python)