It completely depends on what Key you are playing in. I know it is in A, but is it in A Major or A Minor. There is a big difference. Anyway I will list all the diatonic note possibilities for both A Major and Minor.

A Major - A B C# D E F# G#

A Natural Minor - A B C D E F G

A Harmonic Minor - A B C D E F G#

A Melodic Minor - A B C D E F# G# A G F E D C B A

Hope this helps.

-Kyle Hicks ( Kole )
-http://www.myspace.com/kolemusic