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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.
I would definitely change approach, then: you can easily find many occurrences of that approach failing...
I'm actually having the same problem with 59884848495835, having taken the exact same approach as tushar (swapping pairs). It seems to work for every number I throw at it except that one for some weird reason.
Anyway, loving this kata, seemed easy enough at first and it got me hooked for a full day now trying new stuff :)
Can't you just log/print the input?
So, what would be your error, now?
Many more big numbers are going to be tested: try to see a pattern and reason on that :)