I'm curious about the input with negative integer

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    From the problem description, input with negative integer seems to be possible.
    ex) -3-1, 2*-3-4*5
    But it turns out that all testcases use positive integer.
    Even the test program throws exception when I put '-3-1' as an input.
    And most of the solutions here doesn't consider negative input.
    I think the input space needs to be specified in the problem description.
    Any opinions? Please correct me if i'm wrong.

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