%% 
%%  Die DANTE-Edition
%%  Ein Beispiel der LaTeX Referenz
%%  3. Auflage
%% 
%% 
%%  Copyright (C) 2013 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{121.16928pt}
\setlength\parindent{0pt}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
%StartShownPreambleCommands
\usepackage{xparse,graphicx}
\newcounter{anzahl}
\NewDocumentCommand\Liste
   { >{\setcounter{anzahl}{0}\SplitList { , } } m }
   { \ProcessList {#1}{\ErhoeheZaehler}}
\NewDocumentCommand\ErhoeheZaehler { m }
  {\stepcounter{anzahl}\rotatebox{\numexpr10*\theanzahl}{#1}}
%StopShownPreambleCommands
\begin{document}
\Liste{{a,b},{c,d}}\\
Es gibt \arabic{anzahl} Elemente \\
\Liste{a,b,c,d,e,1,2,3,7,{1,2,3}}\\
Es gibt \arabic{anzahl} Elemente
\end{document}