where are you getting the letter "A" from? the manga does not show any letters but just numbersyeh i think im going to say this is what the code is going to come down to
Pages from a his Book or another
Co-ordinates to a location
Information given, from one person representing each number (my theory)
a sentence like this, the first letter is A so it could be like
(A,31,8,Tsunade,7,207,15) 106 is Tsunade since we know thats her bust size.
Anymore im forgetting?