See here : [https://berryberry.hatenablog.jp/](https://berryberry.hatenablog.jp/entry/2022/03/07/230635)
## SolutionWe can get "icandothisallday.zip" first and unzip it. You can see lots of files in your current directory. Like this.![](https://cdn-ak.f.st-hatena.com/images/fotolife/B/Berrys/20220307/20220307195942.png)
We can guess that the flag is in those files. Therefore, we type this and run it.```## written in python 
from glob import glob
directory = "<your current directory absolute path>"    ## like  "/home/ubuntu/Downloads/eCTF/amam"for file in glob(directory + '/*.txt'):    data = open(file, "r").read()    if ("CTF" in data):        print(data)```Now, we can get this flag.```CTF{d3cry47ing_nu3l34r_c0d35}```