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#!/usr/bin/env python3
# Challenge 006
#
# Challenge #1
# Create a script which takes a list of numbers from command line and print the
# same in the compact form. For example, if you pass "1,2,3,4,9,10,14,15,16"
# then it should print the compact form like "1-4,9,10,14-16".
import sys
nums = sorted([int(x) for x in sys.argv[1].split(",")])
output = ""
while nums:
n = nums.pop(0)
output += str(n)
if len(nums)>1 and nums[0]==n+1 and nums[1]==n+2:
while len(nums)>0 and nums[0]==n+1:
n = nums.pop(0)
output += "-"+str(n)
if nums:
output += ","
print(output)
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