\documentclass[10pt]{report}

 % this is a report

\pagestyle{headings}
\begin{document}

\title{title}
\author{author}

\maketitle
\tableofcontents
\newpage

\flushleft

\begin{abstract}

Fusce lobortis luctus risus, in consequat arcu porttitor quis.
Curabitur interdum ligula et dolor commodo pulvinar.

\end{abstract}

Etiam vitae dolor augue

\chapter{chapter1 \"a \"A \"u \"U \"o \"O}

\section{section1 \"a \"A \"u \"U \"o \"O}

Lorem ipsum dolor sit amet, \ldots

\begin{enumerate}

\item consectetur adipiscing elit.

\item Morbi lobortis purus non enim

\begin{enumerate}

\item Aliquam

\begin{enumerate}

\item turpis

\end{enumerate}

\end{enumerate}

\item leo

\item[5.] Quisque lobortis

\item [6.] Duis sed lacus lectus,

\end{enumerate}

Cras pharetra dui quis

% this is the end of an enumerated list

fringilla auctor interdum tortor aliquet.

\subsection{subsection1 \"a \"A \"u \"U \"o \"O}

Nunc \textbf{feugiat} condimentum\\

\subsection{subsection2}

% this is a subsection

\begin{itemize}

\item \textsf{urna} nec consectetur.	

\begin{description}
\end{description}

\end{itemize}

Aliquam arcu augue,\newline
Aliquam arcu augue,\newline

\subsubsection{subsubsection1}

\begin{description}

\item[dapibus] \# \$ \% \& \_ \{ \} sed

\end{description}

\subsubsection{subsubsection2}

\begin{itemize}

\item vestibulum sed, \"a \"A \"u \"U \"o \"O

\end{itemize}

\begin{itemize}

\item[-] item 1

\end{itemize}

Nam id

\chapter{chapter2}

\section{section2}

sodales  
sodales  

\begin{verbatim}

 eget   
  enim. 
\end{verbatim}

Duis arcu sapien

\subsection{subsection1}

\verb+Proin+
\verb*+Proin+

\section{section3}

quis \emph{elit}

\begin{itemize}

\item Quisque vulputate

Curabitur in neque
Donec molestie
\# \$ \% \& \_ \{ \}

\item Etiam ac mauris

\begin{itemize}

\item sem sit amet

\item ligula rutrum vel

\end{itemize}

\item eu bibendum leo

\end{itemize}

\begin{verbatim}
               .'.        
 '..cll.    .lxxdxl'      
 ',:clkx. .;OK0ko;ll;     
  okoddc.oOo,;l::'.;c;    
  xoldo'dkl'..':;;:,:;:   
  lKo,c'lkO,.,,:;,. ;;lo. 
   :xl,;dxKlc;'odddxKd:;c 
     .,.kKOoxoc;x0d.xx,;: 
        d0o 00d l0. ,O;.  
        ox ;lc. ;c   o:   
        :: .,' ..    c'   
        ;    .c,.    ,    
       ..   .'.',   .l.   
      ;'.           .,    
\end{verbatim}

\begin{description}
\end{description}

\end{document}