<?php
$moji = str_split(trim(fgets(STDIN)));
krsort($moji);
$ans = implode("", $moji);
$ans = preg_replace("/</","1",$ans);
$ans = preg_replace("/>/","2",$ans);
$ans = preg_replace("/1/",">",$ans);
$ans = preg_replace("/2/","<",$ans);
echo $ans;