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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.
At that time, because it messed up the expected results. I don't think it matters anymore.
Why do we need to not mutate the input?
Not a site suggestion.
This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution
You're probably allowing less than perfect choices for B. But without your code, there's not much more we can say.
Please post your code, properly marked up and spoilered, if you want it looked at.
I have every reason to believe the tests are correct.
Don't mutate the input array.
https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution
Read this: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution
About your code, you have a typo and your alphabet is wrong.