I am almost certain that I have an entirely correct decryption for 4A, however, when I submitted it I only got a score of 96.4%. I have checked, double checked and resubmitted it several times but I keep getting the same score. The loss of 4% on the score indicates that I have left out roughly 30-40 characters/got 30-40 characters wrong. I have checked by counting the letters on the ciphertext, and excluding punctuation, there are exactly the same amount of characters in my decryption as there are in the original ciphertext. However, there are 33 punctuation characters in the ciphertext, so I am wondering if a bug means that punctuation matters this week.