$27$ Consider the following grammar.

$->"$a$"|"$b$"|"$c$"$

And the following denotational semantics.

denot$("$b$")=-1$

denot$("$c$")=1$

denot$("$a$")=-$denot$()$

What is the mathematical meaning of the program aaab

$-1$

$0$

$1$