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    I think that most people who try this problem are not getting from the requirements/instructions that if a final result ends up with a multiple digit number (e.g. 12, 432, 9345), then the solution needs to be performed again recursively until the result is a single digit number (e.g. 1, 0, 9). This means that 2215 is not equal to 10 since 10 is a result with more than a single digit. Then 10 will need to be processed again and the result will be 1.