I made a code, decipher it. 8'96 7'92- 59 2'929'2- 46'9' 1962'2- 46'3"4 6'9' 7'3"29' 6'5'5 91-2'5" 591-, 46'3"4 16'99'29'6 229'2'5'9'29'5 5'1- 6'5'1' 56'932'2- 1-94 89'65'56' 2"34 6'3"29' 9'49'61-3"2' 2'9'8'9.

Mods deleted my previous question for it not being clear how to solve the question. It isn't meant to be clear, it's meant to be fun to solve because of it's complicatedness.

Email decoded text: academicblock8400

Which words in this excerpt from the count of monte cristo can be used as synonyms to determine the meaning of the word grotto? dant? s entered the second grotto. the second grotto was lower and more gloomy than the first; the air that could only enter by the newly formed opening had the mephitic smell dant? s was surprised not to find in the outer cavern. he waited in order to allow pure air to displace the foul atmosphere, and then went on. 1. air 2. opening 3. mephitic 4. cavern 5. pure 6. atmosphere