letter.tex

\documentclass{article}
\usepackage[utf8]{inputenc}

% template
%% You can change this flag to `False` after finish
\def\IfDraft{True}
%% Template package
\usepackage{responseletter}
%% You can define your custom package in this file
\input{pkg.tex}

% Input the information of paper here
%% The title of the paper
\def\PaperTitle{Title of the paper}
%% ID of paper
\def\PaperId{{JRNL\_YEAR\_NUM}}
%% Revison number
\def\PaperRevision{1}
%% Special issue id
\def\SpecialIssueId{{SI:CONF20XX}}
%% The name of journal or conference
\def\Journal{{Journal of Something}}

%% Names of all authors 
\def\Authors{Name 1, Name 2}
%% Name of author, in the form of `[ID of affiliation]{name}`
\author[1]{Name 1}
\author[2]{Name 2}
%% Information of affiliation, in the form of `[ID of affiliation]{information}`
\affil[1]{University 1, City 1, Country 1}
\affil[2]{University 3, City 2, Country 2}

% Don't show the date
\date{}
\title{\textbf{\PaperTitle}}

% Add your bibtex file here
\addbibresource{ref.bib}

\begin{document}
  
  \maketitle
  
  % Content of the 1st page
  \noindent \textbf{Dear Editors},
  \\[2em]
  \indent We express our gratitude for the time and effort dedicated to the reviewing of our submitted manuscript.
  We worked diligently to address all the concerns raised by the referees.
  Below we provide our detailed response to their comments.
  %We have highlighted the main changes in the paper by colouring the modified text and adding a side note in which the addressed remark is referenced.
  We hope that the applied revisions are to the satisfaction of the editors.
  \\[2em]
  Kind regards,
  \begin{flushright}
    \Authors
  \end{flushright}
  \vfill
  \section*{Manuscript information}
  \begin{description}
    \item[Number:] \PaperId
    \item[Title:] ``\PaperTitle''
    \item[Authors:] \Authors
    \item[Revision:] \PaperRevision
    \item[Submitted to:] \Journal
    \item[Special issue:] \SpecialIssueId
  \end{description}
  \pagebreak
  
  {
    \hypersetup{linkcolor=black}
    \tableofcontents
    \pagebreak
  }

  \input{editor.tex}
  \input{reviewer1.tex}
  \input{how-to-use.tex}

\end{document}