Sometimes conferences ask for response to reviews, which they send as an email. So, you put the whole lot into a text file, and annotate it with your responses. All is going well, till you submit the response, then you discovered that, for no readily apparently reason, the conference insists of PDF. Here is my generic solution.

gistfile1.tex

\documentclass{article}
\usepackage{alltt}

\begin{document}


\begin{alltt}
\input{reviews.txt}
\end{alltt}


\end{document}