#!/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 isinstance(lst[i], int) and lst[i + 1] == lst[i] + 1:
                lst = lst[:i] + [[lst[i], lst[i + 1]]] + lst[i + 2:]
                break
            elif isinstance(lst[i], list) 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 isinstance(elt, int):
            out += repr(elt) + ","
        else:
            out += "%d-%d," % tuple(elt)
    return out[:-1]

codepoints = [int(x.strip) for x in sys.stdin.readlines()]
print printbyrange(rangeify(codepoints))