[极客大挑战 2019]BuyFlag

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源码中发现内容

//	~~~post money and password~~~
if (isset($_POST['password'])) {  //post方法传递password
	$password = $_POST['password'];
	if (is_numeric($password)) { //password不能是数字
		echo "password can't be number</br>";
	}elseif ($password == 404) {  // 绕过 令 password=404a
		echo "Password Right!</br>";
	}
}

获得flag