PUZZLE -4- FIND THE CHARACTER

Today we will see one puzzle. Try to find the answer. Below have the series of characters based on some thing. Find the next character. Find the reason for the character.

M, J, J, A, S, O, ?

Find the next character and reason for that character. Send the answer to 'hari11888blog@gmail.com' and check it whether it is correct or not. Else you need to wait till next puzzle post.

ANSWER TO PREVIOUS PUZZLE:

HR already told, he will ask only one question. 'how did you say' is a second question. So no need to answer for that question.