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Given a word, get the indexes of each letter in the alphabet.
For example: uncopyrightable becomes: [21, 14, 3, 15, 16, 25, 18, 9, 7, 8, 20, 1, 2, 12, 5]
Convert these indexes to the given numeral system.
For example, if the radix is 36, then the array above would become:
['l', 'e', '3', 'f', '...