Access formula issue

Trying to extract text from access table...field info looks like this:

Accrual   Available Balance
-64.0(+40.08p)
0.0(+13.8p)
0.0(+15.33p)

Need to extract the data between the '+' and the 'p'.  And not fixed placement. I tried the following formula:

Right([Accrual   Available Balance],Len([Accrual   Available Balance])-InStr([Accrual   Available Balance],"+")) Left([Accrual   Available Balance],Len([Accrual   Available Balance]) + InStr([Accrual   Available Balance],"p"))

and kept getting an error that read 'The expression you entered contains invalid syntax, you may have entered an operand without an operator'.

Can someone please help!!??!!