---

using System.Collections;

internal class Program
{
    class Arr : IEnumerable
    {
        public IEnumerator GetEnumerator()
        {
            
        }
    }


    private static void Main(String[] args)
    {
        int[] ar = { 1, 2, 3, 4, 5, 6, 7 };
        IEnumerable<int> ie = ar;
        foreach (int i in ie)
            Console.WriteLine(i);
    }
}