using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        int[] nums = {2,0,2,1,1,0, -6};

        SortedDictionary<int, int> dicts = new SortedDictionary<int, int>();

        List<int> sortedList = new List<int>();

        for (int i=0; i<nums.Length; i++)

        {

            dicts.TryGetValue(nums[i], out int val);

            dicts[nums[i]] = val+1;

        }

        foreach (var item in dicts)

            for (int i=0; i<item.Value; i++)

                sortedList.Add(item.Key);

        Console.WriteLine(string.Join(",", sortedList));

    }

}