\documentclass{nasca18}
%%%%%%%%%%%%%%
%
\begin{document}
%
\title{ your title }
%
% The optional arguments may be omitted if there is only one author.

\author[1]{Author A}
\author[2]{Author B}
\author[3]{Author C}
%\author[2]{Name of Author D}
\address[1]{Address of author A}
\address[2]{Address of author B }
\address[3]{Address of author C}

%
% The \shorttitle and \shortauthor commands are mandatory.
% They are used for the running heads.
\shorttitle{A3L Sample Submission}
\shortauthor{A.~Author and B.~Author}
%
\maketitle
\hrule
%
\begin{abstract}

 your abstract 
 
\end{abstract}
%
\medskip
\hrule

%-------------------------------------------------------
\begin{thebibliography}{99}


\end{thebibliography}

%*****************************
\end{document}
