Error in input/output

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From: https://py.checkio.org/mission/how-deep/solve/

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The testcase "extra", "test 9/9", the input is (1,(2),(2,(3))), but in Python type((3)) = int, not tuple, because the parantheses are ignored while parsed by the interpreter. The correct input is (1, (2,), (2, (3,))), if the answer is suposed to be 3, not 2.