Find the minimum number sum of digits of special number that sums to a number N

A special number is a number of the form {..., 111, 11 , 1 , -1, -11, 111, .....}

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Example

Input 19

output 7

Explanation 11 + 11 + (-1) + (-1) + (-1)

2 + 2 + 1 + 1 + 1 = 7 digits