using System;
class Program
{
    static void Main()
    {
        string secretWord = Console.ReadLine();
        string inputMessage = Console.ReadLine();

        int tempCode = 0;
        int sum = 0;
        string decryptedMessage = "";

        //GET CODE
        foreach (var letter in secretWord)
        {
           tempCode += letter;
        }
        string secretWordToString = tempCode.ToString();
        int mask = 0;

        while (secretWordToString.Length>1)
        {
            mask = 0;

            for (int i = 0; i < secretWordToString.Length; i++)
            {
                mask += Convert.ToInt32(secretWordToString[i].ToString());
            }

            secretWordToString = mask.ToString();
        }

        mask = Convert.ToInt32(secretWordToString);

        //DECPYPT ALGORITHM
        for (int i = 0; i < inputMessage.Length; i++)
        {
            if (inputMessage[i]% mask == 0)
            {
                decryptedMessage += (char) (inputMessage[i] + mask);
            }
            else
            {
                decryptedMessage += (char)(inputMessage[i] - mask);
            }
        }
        char[]reversedOutput = decryptedMessage.ToCharArray();
        Array.Reverse(reversedOutput);

        foreach (var token in reversedOutput)
        {
            Console.Write(token);
        }
        Console.WriteLine();
    }
}