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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.
The result can have no leading zeroes. The rearranged number for '50011117' is something like
10011175. That takes more changes.I found some errors in the Python tests. An example would be number 50011117, its minimun number of changes is 7 but the tests say its 9. It also happens with numbers like 50011111112 , 7000033333335 , 500033332 and similar ones.