DetectiveBoev

using System;
using System.Text;
class DetectiveBoev
{
    static void Main()
    {
        string secretWord = Console.ReadLine();
        string encrMSG = Console.ReadLine();
        StringBuilder sb = new StringBuilder(encrMSG);
        short mask = 0;
        for (int i = 0; i < secretWord.Length; i++)
        {
            mask += (short) secretWord[i];
        }
        string maskString = mask.ToString();
        while (mask > 9)
        {
            mask = 0;
            for (int i = 0; i < maskString.Length; i++)
            {
                mask += short.Parse(maskString[i].ToString());
            }
            maskString = mask.ToString();
        }
        //Console.WriteLine(mask); // TEST
        for (int i = 0; i < sb.Length; i++)
        {
            if (sb[i] % mask == 0)
            {
                sb[i] += (char) mask;
            }
            else
            {
                sb[i] -= (char) mask;
            }
        }
        for (int i = sb.Length - 1; i >= 0; i--)
        {
            Console.Write(sb[i]);
        }
        Console.WriteLine();
    }
}