![image](https://user-images.githubusercontent.com/87527216/214194124-d199be4a-a3c4-4fd1-9386-98a6f9749dd6.png)
When I checked the inside of the provided directory, there was a directory and the directory name was '}', so I thought there was a flag, and I tried "ls -R" 
![image](https://user-images.githubusercontent.com/87527216/214194178-117a3552-6f7d-4c50-9008-8764ee3bab51.png)
At the end, I figured out that there is a flag format, which is KCTF, and programmed a python code that outputs FLAG to make it easier to see.
```pythonimport os
flag = []os.chdir("./challenge")
while True:    try :        Dir = os.listdir()[0]        flag += Dir    except IndexError:        flag = flag[::-1]        break    os.chdir(Dir)
print("".join(flag))```
FLAG : ```KCTF{f0ld3rs_1n51d3_f0ld3rs}```