\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[greek,english]{babel}
\usepackage{alphabeta}
\usepackage{tabularx}
\begin{document}

\begin{tabular}{|l|c|r|}
\hline
cell 1 & cell 2 & cell 3 \\
\hline
cell 4 & cell 5 & cell 6 \\
\hline
\end{tabular}

