<?php
$_fp = fopen("php://stdin", "r");
$alphabet = explode(' ', trim(fgets($_fp)));
$str = trim(fgets($_fp));
$maxH = 0;
$basis = ord('a');
for ($i = 0; $i < strlen($str); $i++) {
    $h = $alphabet[ord($str[$i]) - $basis];
    if ($h > $maxH) $maxH = $h;
}
echo ($maxH * strlen($str));
?>