Write a method named digitsum that accepts an integer as a parameter and returns the sum of the digits of that number. For example, digitSum(29107) returns 19 (2+9+1+0+7). For negative numbers, return the same value that would result if the number were positive. For example, digitSum(-456) returns 15 (4+5+6). Assume that the maximum length of an input number is 10. In case of wrong input, you must print out text "error". Input: 25 Output: 7

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