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In subsequent tasks, trailing spaces in the answer are ignored, but this isn't the case for Problem 3, which is an inconsistency.
Hmm, perhaps it isn't related a trailing space. I sometimes seem to hit an issue where my output is identical to the supposedly correct output, but is deemed incorrect.
The problem was, I was clicking the Python 3 button after pasting my answer, and then I clicked submit before the server put in the generated answer.
Ah, thank you for resolving this!
To be honest you at first puzzled me so much that I tried to reproduce the issue and failed to respond in time, sorry!
By the way it is a hint that probably submission button should be disabled while solution is being generated! I'll try to care about it, thank you!
I think I would have figured this out much sooner if a failed problem attempt displayed the incorrect answer that was given, and not just the correct answer.
> if a failed problem attempt displayed the incorrect answer that was given
Thanks for your suggestion! I was told about it few times, but only after your advice I at last composed myself enough to make necessary improvement.
I hope it works now!