<?php
$s = (string)trim(fgets(STDIN));
$line = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
for ($i = 1; $i <= strlen($s); $i++) {
    $idx = strpos($line, $s[$i-1]);
    $i_tmp = $i;

    while($i_tmp > 25) {
        $i_tmp -= 26;
    }
    echo $line[$idx-$i_tmp];
}
echo PHP_EOL;
?>