\documentclass[12pt]{article}
\usepackage{amsmath,amssymb}
\pagestyle{empty}
\textheight=23.5cm
\textwidth=15.7cm
\voffset=-0.8cm
\hoffset=-1.4cm
\sloppy
\begin{document}
\begin{center}
{\LARGE Title}
\end{center}
\vskip 0.1cm
\centerline{\large \large A.~Authors }
\vskip 0.7cm
The body of the abstract here
\medskip
\noindent
\begin{minipage}[t]{7.5cm}
\small{ Your address here }
\end{minipage}
\end{document}