@DavidRSoftware your while condition is wrong, that's why your code randomly failed.

I think I ran into the same problem and what worked for me is to click on the attempt button multiple times until my solution got accepted. I don't know why what I wrote would produce different results at different time but maybe the server is producing the errors.

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Hey, I am passing all the tests except some random ones where the strings are insanely long and my code results "" which its not supposed to do. Any pointers? I am hesitating to post my code, because of spoiling it and all.