old-36 -- vi

URL: https://webhacking.kr/challenge/bonus-8/

While editing index.php file using vi editor in the current directory, a power outage caused the source code to disappear.
Please help me recover.

If you're familiar or ever used vi you must know that it keeps backups of file. They are called swap files, usually hidden and with swp extension.

➜ curl 'https://webhacking.kr/challenge/bonus-8/.index.php.swp' -b 'PHPSESSID=3052403292' --output -
U3210#"! Utpad�����??>  $flag = "FLAG{what_about_the_nano_editor?}";<?php