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Uhm, you mean A to A# or A to B♭?
Edit:
nvm, was thinking left -> right keyboard but obviously poster was thinking right -> left.
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Whoops. Hahaha. Maybe I'm the one with the scale problem.

not this piano.
I made the mistake, however most sharps and flats have two names, depending on if you're moving up or down a scale. #howcanibackpedalfurther
G# = A Flat.