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

namespace cryptCaesar
{
    class Crypt
    {
        string alph = "ЙЦУКЕНГШЩЗХЪФЫВАПРОЛДЖЭЯЧСМИТЬБЮйцукенгшщзхъфывапролджэячсмитьбюQWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm1234567890,.";
        public string encrypt(int key, string text) {

            int lenalph = alph.Length;
            int tmp;
            string res = "";

            foreach (char c in text)
            {
                if (alph.IndexOf(c)!=-1)
                {
                    tmp = (alph.IndexOf(c) + key) % lenalph;
                    res += alph[tmp];
                }
                else
                    res += c;
            }
            return res;
        }

        public string decrypt(int key, string text)
        {

            int lenalph = alph.Length;
            int tmp;
            string res = "";

            foreach (char c in text)
            {
                if (alph.IndexOf(c) != -1)
                {
                    tmp = (alph.IndexOf(c) - key + lenalph) % lenalph;
                    res += alph[tmp];
                }
                else
                    res += c;
            }
            return res;
        }
    }
}