using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int[] num = { 1, 3, 0, 2, 0 };

        List<int> numList = num.OrderByDescending(x =>x).ToList();

        foreach(var nu in numList)

        {

            Console.Write(nu);

        }

        //2nd solution

        string numList1 = null;

        string numList2 = null;

        foreach(var nu in num)

        {

            if(nu != 0)

            {

                numList1 +=  nu.ToString();

            }

            else

            {

                numList2 += nu.ToString();

            }

        }

        Console.WriteLine();

        Console.WriteLine(numList1 + numList2);

    }

}