using System;

public class Program

{

    public static void Main()

    {

        var array = new int[] {0,1,0,3,12};

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

        {

            int num = array[i];

            if (num != 0)

                continue;

            for (int j = i + 1; j < array.Length; j++)

            {

                int num2 = array[j];

                if (num2 == 0)

                    continue;

                array[i] = num2;

                array[j] = num;

                break;

            }

        }

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

        {

            System.Console.WriteLine(array[i]);

        }

    }

}