Rating:

1. Connect with netcat to the specified server
2. Realize there is nothing you can do and give up by typing exit in terminal
3. Get the big integer upon exiting
4. Decode the big integer. I've personally used: https://scwf.dima.ninja/
5. Get the flag: flag{sometimes_it_is_best_to_step_away}

Original writeup (https://github.com/TrollzorFTW/writeups/tree/master/bsidesbos/warmups/giveup).