#!/usr/bin/env python
# codelist
# given list of integers, one per line, outputs a minimal list of ranges
# describing the list

# this is useful for codepoints that are in a font, based on list of codes
# output format is suitable for codepoints="" in Wesnoth fonts.cfg

import sys

def rangeify(lst):
    "Turn ranges of adjacent ints in a list into [start, end] list elements."
    lst.sort()
    lst.append(None)
    while True:
        for i in range(len(lst)-1):
            if type(lst[i]) == type(0) and lst[i+1] == lst[i]+1:
                lst = lst[:i] + [[lst[i], lst[i+1]]] + lst[i+2:]
                break
            elif type(lst[i]) == type([]) and lst[i+1] == lst[i][-1]+1:
                lst[i][1] = lst[i+1]
                lst = lst[:i+1] + lst[i+2:]
                break
        else:
            break
    lst.pop()
    return lst

def printbyrange(lst):
    out = ""
    for elt in lst:
        if type(elt) == type(0):
            out += `elt` + ","
        else:
            out += "%d-%d," % tuple(elt)
    return out[:-1]

codepoints = map(lambda x: int(x.strip()), sys.stdin.readlines())
print printbyrange(rangeify(codepoints))