<?php

$alp = array("A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z");

$in = trim(fgets(STDIN));

$que = str_split($in);

foreach($alp as $num => $alp1){
    foreach($que as $numQue => $alpQue){
        $numQue_Mi = $numQue +1;
        if($alpQue === "A"){
            echo "Z";
        }
        if($alp1 === $alpQue){
            $mi = $num - $numQue_Mi; 
            echo $alp[$mi];
        }
    }
}

echo "\n";