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1.) The input parameter
numis a number so you can't use split on it. You need to cast it to a string first.2.) You must return the final answer, not print (puts) it to the console. You need to return the answer as an integer. Input of 3212 must get an output of 9414 only by returning it.
3.) You must return your answer as a number, not a string.
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@AcesOfGlory is correct.
If you read some of the other comments to this Kata, you will find many others that had the exact same issue.
My favorite example is this: https://www.codewars.com/kata/554b4ac871d6813a03000035/discuss#5862f485e20244604600003b
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Which programming language?
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