The official guide says that you should enter it exactly as it appears on your transcript. My pass/fail courses are graded as 'S' and the CAS grade also shows 'none'. Also says 'none' if you enter 'P'. It should appear as 'none' as shown in the guide, because the grade is not used to calculate your AADSAS GPA. The guide explicitly states that grades other than A-F, such as P, S, CR, AU, I, U, or W, will not be used to calculate your ADEA AADSAS GPA. Hope this helps!