\documentclass[12pt]{amsart}

\title{Title of the Abstract}

\author{Author 1}
\address{Department, Institute, City, Country}
\email{Your email}

\author{Author 2}
\address{Department, Institute, City, Country}
\email{Your email}

\keywords{Keyword 1, Keyword 2}
\subjclass[2020]{Primary 51MXX; Secondary 51MXX}

\begin{document}
	
	\maketitle

	\begin{abstract}
		Abstract text goes here. 
	\end{abstract}
\bibliographystyle{amsalpha}
\begin{thebibliography}{99}
\bibitem{A} If any.
\end{thebibliography}
\end{document}