> this solution was the first that i tried.. but this does not run correctly.. 
> because:
> when we try to sort this number in alphanumeric order we obtain that number 
> -0010 is higher than -0001
right. I failed to see that.
So you would have to use a complement for negative numbers as well e.g. using
-9989 for -10, -9998 for -1, ...

But shifting the interval is easier of course.


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