[vadman]

Surely you mean (++ A)?

[tsm]

    (1+ 'A)

[ohyes]

Symbol A is not of type number.

(1+ a)

[gsg]

A++ is a grade, not a number. Clearly what you need is #S(grade :letter A :decorations (+ +) :rapidly-escalating-pedantry t) or some other meaningful representation.