What letter should replace the question mark? ? E B B A S A

What letter should replace the question mark? ? E B B A S A What letter should replace the question mark. What letter should replace the question mark? What letter should replace the question mark?O.(Opposite let 如题,what letter should replace the question mark? 57.What letter should replace the question mark? which letter should replace the question mark What number should replace the question mark which letter should be replace the question mark what letter should the question mark be What letter can replace the question mark?61 5 Can you guess what number should replace the question mark?