code in python please. the private key d is 308850299

Problem #2 The following encrypted message is a key piece of evidence used during the recent Martha Stewart trial: BNBPPKZAVQZLBJ The prosecution team was well aware that Martha is fond of the RSA encryption scheme and that her published public key is (nb)- (536813567, 3602561). Furthermore, in addition to her predilection for doilies and throw pillows, she is predisposed to dealing with plaintext messages in 6-letter blocks using the usual 26-letter alphabet (converted to an integer between 0 and 26 1 in the usual way) and ciphertext messages in 7-letter blocks in the same alphabet. What did the prosecution team learn from Martha's message? Please comment on the particulars of the RSA cryptosystem used by Martha.