using System;

​

public class Program

{

    public static void Main()

    {

        DigitalRoot(942);

    }

    public static int DigitalRoot(long n) 

    {

        string nString = n.ToString();

        char[] nCharArray = nString.ToCharArray();

        int number = 0;

        for (int i = 0; i < nCharArray.Length; i++) 

        {

            number += Convert.ToInt32(nCharArray[i]);

            Console.WriteLine(number);

        }

        return 2;

    }

}