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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 ASCII values for 'a-z' are 97-122 (0b1100001-0b1111010), and 'A-Z' are 65-90 (0b1000001-0b1011010).
We only need the last 5 bits (0b11111 is 31) (since the first two bits are the same) to build our bitmask.