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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
You checked all permutations of the digits which take so much time O(2^n). Actually there is a O(n^2) way to solve the problem
No, there are only 12 tests in Python and the longest is 14 chars long, it's a problem with your loops.
It seems you have an infinite loop, because the input isn't that long to cause timeouts.