treasure finder

<?php

$key = array_map("intval", explode(" ", readline()));
$input = readline();

$finalResult = "";
$finalResults = [];
while ($input !== "find") {
    $input = str_split($input);

    for ($j = 0; $j < count($input); $j++){
        for ($i = 0; $i < count($key); $i++){
            if ($i === count($key)) {
                break;
            }
            $input[$i] = chr(ord($input[$i]) - $key[$i]);
        }
        $finalResult .= substr(implode("", $input), 0, count($key));
        array_splice($input,0, count($key));
    }

    if (count($input) !== 0) {
        for ($n = 0; $n < count($input);$n++){
            if ($n >= count($key)) {
                $n = 0;
                array_splice($input, 0, count($key));
            }
            $finalResult .= chr(ord($input[$n]) - $key[$n]);
        }
    }

    $finalResults[] = $finalResult;
    $finalResult = "";
    $input = readline();
}

foreach ($finalResults as $result) {
    list($randomWord, $treasureName, $coordinates) = explode("&", $result);
    if (preg_match("/(?<=\<)\w+(?=\>)/", $coordinates, $matches)) {
        $matched = $matches[0];
    }
    echo "Found $treasureName at " . $matched . PHP_EOL;
}