Header question

[azr124]

Hi all,

I have the following problem:

I'm writing a document with several sections which I don't want to be numerated. For example, it may have 3 sections:

-Research
-Teaching
-Service

However, I want the page numbering to appear like this:

A1, A2, A3,... for the first section (Research)
B1, B2, B3,... for the second section (Teaching)
C1, C2, C3,... for the third section (Service)

any idea on how can I achieve this?

thanks a lot!