using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Intro
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] nums = Console.ReadLine()
                .Split(',')
                .Select(int.Parse)
                .ToArray();

            var seqNums = new Dictionary<int, List<int>>();

            for (int i = 0; i < nums.Length; i++)
            {
                int currentNum = nums[i];
                seqNums.Add(i, new List<int>() { currentNum });

                int prevIndex = -1;
                int prevCount = -1;

                for (int j = 0; j < i; j++)
                {
                    int num = nums[j];
                    int count = seqNums[j].Count;

                    if (num < currentNum && prevCount < count)
                    {
                        prevIndex = j;
                        prevCount = count;
                    }
                }

                if (prevIndex >= 0)
                {
                    seqNums[i].AddRange(seqNums[prevIndex]);
                }
            }

            int maxSeqCount = seqNums.Max(s => s.Value.Count);
            var longestSeq = seqNums.First(s => s.Value.Count == maxSeqCount).Value;
            longestSeq.Reverse();

            Console.WriteLine(string.Join(",", longestSeq));
        }
    }
}