The buttons are labelled in-game already as J A B C S. That way it doesn’t matter if you set a move to the Playstation triangle button or a keyboard spacebar or whatever else.
So you might do jump A, A, B as a combo with Grave. Grave can also do jump A, f+A, B as a combo. It’s also common to say something like this for Setsuki’s standard combo: air C, air A, (land), A, S.