I wrote a script to obtain a flag, but it seems too unlikely to return a result with a simple for statement. Can I get it through threading? The flag hasn't been output for a few hours, so I'm leaving a question about a better method.

When I solved this, I understood all the codes, but I haven't been able to get the hang of it for a few days because there are too many probabilities using the method I think.. I would appreciate it if you could give me just a little bit of direction..