What is wrong?

Question

It is task "Security". All is right instead of test 4.
https://code.sololearn.com/c8qRNgpumvnl/?ref=app

Answer 1

The problem description says there can be more than one guard. Change the code to look for substrings instead of exact matches.

Answer 2

Why you print ALARM for empty string?

Answer 3

The alarm should be printed by T$ and $T combinations otherwise quite if you carefuly read the description.