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Possible Duplicate:
Error: Counter too large! with \alph{cntr} and cntr>26

I need Alphabetic numeration of my chapters.

But if they are more than 26 LaTeX gives an error message.

How I can teach LaTeX to continue numbering as AA, AB, AC etc.?

\documentclass{book}

\begin{document}

\appendix

\setcounter{chapter}{26}

\chapter{foo}

\end{document}

I get the following error message:

LaTeX Error: Counter too large.

marked as duplicate by kiss my armpit, egreg, Seamus, Werner, lockstep Oct 25 '12 at 14:04

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