using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        int[] a = { 10, 0, 0, 15, 0, 0, 0, 10, 10 };

        var newList= a.ToList().Where(x=>x==0).ToList();

        newList.AddRange(a.ToList().Where(x=>x!=0));

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

    }

}