using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        foreach(var x in Partition("arunava", 1))

        {

         Console.WriteLine(x);

        }

    }

        public static IEnumerable<String> Partition(string s, int size)

        {

            for (var i = 0; i < s.Length; i += size)

            {

                yield return s.Substring(i, Math.Min(size, s.Length - i));

            }

        }

}