\documentclass{article}

\title{Title of the S.A. Mousavi's article}
\author{S.A. Mousavi}

\begin{document}
\maketitle
\begin{abstract}
Some text Some text Some text Some text Some text Some text Some text 
\end{abstract}
\section{Intro}
Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text 
\end{document}