using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        int[] arr = [..10];

        foreach (int i in arr)

        Console.WriteLine("Hello World " + i);

    }

}

​

public static class Ext

{

    public static IEnumerator<int> GetEnumerator(this int input)

    {

return Enumerable.Range(1, 10).GetEnumerator();}}