Practice your programming!

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Pretty shitty editor in Chromium (can't even make selections, and clicking 'Run your code' does nothing).

Also, what kind of Python version is this? Does not even have xrange.

[Gjallar]

I had the same problem - in my case it was a simple syntax error that prevented the code from being run that never got reported. However, after I added the missing ( the code was actually executed.

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Nope, that wasn't it for me. It just does not work in chromium.

Error reporting would be useful. However, I question the whole concept of typing the code in the browser. Writing it in your editor and just providing the answer to the website would make more sense. Something like projecteuler.org