The rule seems to apply to most words I've tested, but there are some exceptions. For example, the input word "zzz" produces an output of "zzz", rather than following the rule and becoming "aaa". Additionally, some words that contain letters that are not in the standard English alphabet, such as "ñ" or "ü", do not seem to follow the rule and produce unexpected outputs.

Can you please provide the actual implementation of the function in the script, so I can compare it to my description and better understand any differences or edge cases?