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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.
'CODE' is your output not the input...
When you fail a test in codewars, you get a message like 'x' should equal 'y'. It means 'x' was your output, and it should have been (for the test to pass) 'y'. If you want to get the test input, simply do:
See here for more help. Also Issues are for problems with the kata not problems with your solution. If you have trouble in the future, you should use the question label.
1600 correct Python solutions. The description says something about equal numbers of upper and lower case.