<?php
//No.18 うーさー暗号
//A:65,Z:90
$line = trim(fgets(STDIN));
$array=str_split($line);
foreach($array as $key =>$value){
  $value1=ord($value);
  $value1=$value1-($key +1);
  while($value1<65){
    $value1=$value1+26;
  }
  $value=chr($value1);
  echo $value;
}

?>