%\documentclass[11pt]{article}
\documentclass[11pt,a4paper]{scrbook}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
%\usepackage{geometry}
%\geometry{letterpaper}
\usepackage{graphicx}
\usepackage{amssymb}
\usepackage{hanging}

\newcommand{\LINE}{\noindent\rule{\textwidth}{1pt}}

\newcommand{\QA}[4]{
\LINE\\
\noindent
\begin{minipage}[t]{.5\textwidth}
\begin{flushleft}
{#1}\par
\hangpara{1em}{0}
{#2}
\end{flushleft}
\end{minipage}\begin{minipage}[t]{.5\textwidth}
\begin{flushleft}
{#3}\par
\hangpara{1em}{0}{#4}
\end{flushleft}
\end{minipage}
\par\vspace{2ex}
}

\title{The Little Pythoneer}
\author{Marek Kubica}

\begin{document}
\maketitle

% include?
\input{simple}
\input{imitation}
\input{decorate}
\input{meta}

\end{document}