The Messy Mirror

Real sentences hide their mirrors under spaces, punctuation, and SHOUTING. Clean first, check second. 🧹

You get a sentence. Keep only the letters, lowercase them, then mirror-check. Print mirror or not a mirror.

Example:

Input: sentence = "No lemon, no melon!" Output: mirror

Cleaning to lowercase letters only gives "nolemonnomelon", which reads the same forwards and backwards.