using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        List<string> startList = new List<string>() {"12/12/2019", "12", "7", "20a", "6",  "not a number", "5", "24", "39", "&34", "", "2", "58,02"};

        //List<int> goalList = new List<int>() {2,6,12,24};

​

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

        foreach (string s in startList)

        {

            int v;

            if (int.TryParse(s, out v) && v % 2 == 0 )

            {

                goalList.Add(v);

            }

        }

        goalList = goalList.Order().ToList();

        foreach (int i in goalList)

            Console.WriteLine(i);

    }

}