using System;

using System.Threading.Tasks;

public class Example

{

    char[] xyz = { 'M', 'N' , 'O' , 'P' };

    public System.Collections.IEnumerator GetEnumerator()

    {

        foreach(char ch in xyz)

        {

            yield return ch;

        }

    }

}

    public class Program

    {

        public static void Main(string[] args)

        {

            Example mc = new Example();

            foreach(char ch in mc)

            {

                Console.Write(ch + " ");

            }

        }

    }