I wrote a bash script to extract recursive archive and get the flag:
```#/bin/bashfile="0.zip"if [ -f "$file" ]; then	for i in {1..1650}; do	7z e ${file} > /dev/null;	file=`7z l ${file}|grep -Eo "[0-9]{1,4}\.(tar$|tar\.bz2$|zip$|kz3$|kz2$|tar\.gz$)"|tail -1`;	echo "${file} num:$i";	donefifind ./ -name "*.txt" -exec  cat {} \; |uniq```