Yesterday, I organized a contest with various challenges the participants had to solve. I put 6 very simple puzzles that were solved almost instantly, and the deadline was supposed to be until Sunday. So, while the fastest user was figuring out the last puzzle (The hardest one, had to do with reverse-engineering), I made another one. This one made him give up after several hours, and now he's blaming me for torturing him with these challenges.
Before giving the puzzle itself, I must say that the solution to all challenges in the competition was a "flag" with this syntax: ABcD-1234-ABcdEFGhIJ
, where letters can be upper- or lowercase, but the dashes stay where they are (They are constant).
Anyways, here's the final challenge.
+:.++++++++++++.+.++++.++++++++++.+++++++++++.+.+.+++++++++.+.+.+++++.++++++.+.++++.++.+.+.+.+.+.+.+.+.+.+.++++++++.+.+.+.++++++++++++++++++++.++++.+.++.+.+++++++.+.+.++++++.+.+.+.+.+.+.+.++.++++++.++++.++.+.++++++.+.+++++.++.+++++.+.+.++++.+++++.+.+.++++++.+.+.+.+.++++.+.+.+++++++++++++++.
[:-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------.+++++++++++++++++++.++++++++++++++.++++++++++++.+++++++++++.++++++++++++++++++++++++++++++++++++++++++++++++.++++++++++++++.++++++++++++++++++++++++.+++++++++++++.++++++++++++++.++++++++++++.++++++++++++++++.+++++++++++++.
-:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------.+.+.+.+.+.+.+.+.+++++++++.++.+.+.+.+.++++++.++.++.+.+++++++++.++.+++++++++++.+.+.+++++++++++++++++++++.+.+.+.+.+++++++.+.+.+.+.+.+.++.+.+.++.++.+.+.++++++++++++.+.+.+.++++++++.+++++++++++++.+.+.+++++++++++.+.+.++++++++++++.+.+++++++++++.++++++++.++++++++.++++++++++.+.++.+.+.+.+.
]:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------.++++++++++++++.+++++++++++++.+++++++++++.++++++++++++.+++++++++++++++++++++++++++++++++++++++++++++++.+++++++++++++++++.+++++++++++++++++++++.++++++++++++++.++++++++++++++.+++++++++++.++++++++++++++++.+++++++++++++++.
.:----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------.++++++++++++++.++++++++++++.+++++++++++.+++++++++++++.++++++++++++.++++++.+++++.++++++++.++++.+++++++++++++.++++++++++++++++.+++++++++.++++++++++++.+++++++++++++.++.+++++++++++++.+++++++++++.+++++++++++++++.+++++++++++++++.
>:-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------.+++++.++++++++++.++++.+++++++.++++++.+++++.++++++.+++++++.+++++.+++++++++++++++++++++++++++++++++++++++++++.++++.+++++++++++.++++++.+++++++++++++++++.++++.+++++++++.+++++.++++++++.++++++.+++++.++++++.++++++++++.++++++.++.+++++++++.++++.
<:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------.++++++++++++++.+++++++++++++.+++++++++++.++++++++++++.+++++++++++++++++++++++++++++++++++++++++++++++.+++++++++++++++++.+++++++++++++++++++++.++++++++++++++.++++++++++++++.+++++++++++.++++++++++++++++.+++++++++++++++.
The only hint given was brainf*ck, but not really
. (The hint was not actually censored.) Good luck.