How do I get input into my program from the security challenge?

Question

I tried using sys.argv, but all I got was the filename of the script. Using the input library also yielded nothing.

Answer 1

Just seconds or minutes afterwards, I figured out that I need to use input(). However, one of the test cases is hidden. It fails, and I can't figure out why.

Answer 2

No, I just solved the challenge. I unlock the solver badge.