"I've just about had enough of these puzzles, but here's a final, fiendish flummoxer for you. How well do you know your polygons?"

Decoding the message will reveal a question. The required solution is the answer to the question. Please enter your answer below. If the answer is a number please enter it in numerical form, e.g. 55. If the answer is a word, please enter the word, e.g. omega.

Alan Turing Cryptography Competition 2022 is organised by the The Department of Mathematics at The University of Manchester.
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