<?php
$stdin = trim(fgets(STDIN));
// $array = preg_split('/\s+/', $stdin);
list($a, $b) = preg_split('/\s+/', $stdin);
$a *= 1000;
$b *= 3600;
echo ($a == $b ? "same" : ($a > $b ? "KoD" : "blackyuki"));
?>