Detective_Boev

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

namespace _02.Detective_Boev
{
    class Detective_Boev
    {
        static void Main()
        {
            string secretWord = Console.ReadLine();
            string encryptedMessage = Console.ReadLine();
            int sum = 0;
            int mask = 0;
            int digit = 0;
            string symbol = "";

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

            while (sum > 0)
            {
                digit = sum % 10;
                mask += digit;
                sum /= 10;
            }

            for (int i = 0; i < encryptedMessage.Length; i++)
            {
                if (encryptedMessage[i] % mask == 0)
                {
                    symbol += (char)(encryptedMessage[i] + mask);
                }
                else
                {
                    symbol += (char)(encryptedMessage[i] - mask);
                }
            }

            char[] charArray = symbol.ToCharArray();
            Array.Reverse(charArray);
            string reversedMessage = new string(charArray);
            Console.WriteLine(reversedMessage);
        }
    }
}