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Statement

 Goal

You are given an array of numbers and must simplify the array by replacing ranges of 3 or more items with the shorthand #-# equivalent and returning the result as a string, sorted from lowest to highest
Input
Line 1: A string representing an array of digits to simplify and reduce.
Output
A comma separated string containing the sorted and simplified range sets.
Constraints
1 ≤ N ≤ 100 where N is each item in the array
Example
Input
[1,2,5,6,7,9,12,55,56,57,58,60,61,62,64,65,70]
Output
1,2,5-7,9,12,55-58,60-62,64,65,70
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