/**
 * Auto-generated code below aims at helping you parse
 * the standard input according to the problem statement.
 **/

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;


class Solution
{
    static void Main(string[] args)
    {
        string N = Console.ReadLine();
        // Write an action using Console.WriteLine()
        // To debug: Console.Error.WriteLine("Debug messages...");
        //Removing the brackets at the start and the end of the string
        N = N?.Remove(0, 1);
        N = N?.Remove(N.Length - 1, 1);
        List<int> ints = new List<int>(Array.ConvertAll(N?.Split(','), int.Parse));
        List<int> finalI = new List<int>();
        string finalRanges = "";
        ints.Sort();
        List<string> intsString = ints.ConvertAll(s => s.ToString());
        int tripleC = 0;
        for (int i = 0; i < ints.Count; i++)
        {
            if (i + 1 < ints.Count && ints[i] + 1 == ints[i + 1])
            {
                tripleC++;
                finalI.Add(ints[i]);
            }
            else
            {
                if (tripleC > 1)
                {
                    // Add the one after as the previous one will fail for the end of the range, example: range is 5-7,previously would print 5,6 instead of 5,6,7
                    finalI.Add(ints[i]);
                    finalRanges += finalI[0] + "-" + finalI[finalI.Count - 1];
                    // Removing the ranges from the ints string list to add in the finalranges
                    intsString.RemoveRange(intsString.IndexOf(finalI[0].ToString()), finalI.Count);
                }

                if (finalRanges != "" && finalRanges[finalRanges.Length - 1] != ',')
                    finalRanges += ",";
                tripleC = 0;
                finalI.Clear();
            }
        }

        ints = intsString.ConvertAll(int.Parse);


        string[] ranges = finalRanges.Split(',');
        foreach (var str in ints)
        {
            Console.Error.Write(str + ",");
        }
        Console.Error.WriteLine(" ");
        int[] rangeInts;
        for (int i = 0; i < ranges.Length - 1; i++)
        {
            int counter = 0;
            string s1 = ranges[i].Substring(0, ranges[i].IndexOf('-'));
            string s2 = ranges[i].Substring(ranges[i].IndexOf('-') + 1);
            Console.Error.WriteLine("s1 {0} s2 {1}", s1, s2);
            rangeInts = new[]
            {
                    // Finding the first and second number by substringing the start to before the hyphen, then after the hypen to the end to find the two numbers
                    int.Parse(s1),
                    int.Parse(s2),
                };
            for (int j = 0; j < ints.Count - 1; j++)
            {
                if (ints[j] < rangeInts[0] && ints[j + 1] > rangeInts[1])
                {
                    //insert the range in between the two values it's closest too, adding i as the intsString will be
                    // a different length to the ints so they will get put in a row without it
                    intsString.Insert(j + 1 + i, ranges[i]);
                    Console.Error.WriteLine(intsString[i]);
                    break;
                }
            }
        }

        for (int i = 0; i < intsString.Count; i++)
        {
            string s = intsString[i];
            if (i < intsString.Count - 1) s += ",";
            Console.Write(s);
        }
    }
}