using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {   

    int splitPosition=1;

    int cnt=1;

    string s = null;

    char[] characters = "abcdefghi".ToCharArray();   

    foreach (char word in characters)

    {

        if(splitPosition==cnt)

        {

         s += word+",";      

         cnt=0;

        }

        else

        {

        s += word;          

        }

        cnt++;

    }

     s= s.TrimEnd(',');

     Console.WriteLine(s);

    }   

}