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EIPAGES - Page numbers |
When listing document page numbers, it is common to use "-" for the first and last page numbers instead of all pages for at least 3 consecutive pages. Given page numbers needed to list, use the "-" sign to shorten the list
Input
The first line is N, 1≤N≤1000 , the page number listed.
The next line contains N integers, representing page numbers. The numbers are all unique.
Output
Print out a list of pages in order from smallest to largest.
Example
Input: 6 180 141 174 143 142 175 Output: 141-143 174 175 180