using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

class DetectiveBoev
{
    static void Main()
    {
        string secretWord = Console.ReadLine();
        string encryptedMessage = Console.ReadLine();

        int mask = 0;
        for (int i = 0; i < secretWord.Length; i++)
            {
                mask += secretWord[i];
            }

        while (mask > 9)
        {
            mask = CalcMask(mask);
        }

        char[] arr = encryptedMessage.ToCharArray();
        for (int i = 0; i < arr.Length; i++)

        {
            if (arr[i] % mask == 0)
            {
                arr[i] = (char)(arr[i] + mask);
            }
            else
            {
                arr[i] = (char)(arr[i] - mask);
            }
        }

        arr = arr.Reverse().ToArray();
        Console.WriteLine(new string(arr));

    }

    private static int CalcMask(int mask)
    {
        int sum = 0;
        while (mask > 0)
        {

            sum += mask % 10;
            mask = mask / 10;

        }
        return sum;
    }
}