\documentclass[a4paper]{article}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{a4wide,graphicx,xcolor,verbatim,url,fancyvrb}
\usepackage{amsmath,amssymb,booktabs,longtable,textcomp,eurosym,latexsym}

\newenvironment{question}{\item \textbf{Problem}\newline}{}
\newenvironment{solution}{\textbf{Solution}\newline}{}
\newenvironment{answerlist}{\renewcommand{\labelenumii}{(\alph{enumii})}\begin{enumerate}}{\end{enumerate}}

\DefineVerbatimEnvironment{Sinput}{Verbatim}{fontshape=sl}
\DefineVerbatimEnvironment{Soutput}{Verbatim}{}
\DefineVerbatimEnvironment{Scode}{Verbatim}{fontshape=sl}
\newenvironment{Schunk}{}{}
\setkeys{Gin}{width=0.8\textwidth}

\providecommand{\tightlist}{\setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}
\providecommand{\pandocbounded}[1]{#1}
\newcounter{none}
\def\LTcaptype{none}
\setkeys{Gin}{keepaspectratio}

%% \exinput{header}

\begin{document}

\begin{enumerate}
%% \exinput{exercises}
\end{enumerate}

\end{document}
