using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string enc = "tett rett nete tsvn wnyh este brwn yeez";
            var table = Enumerable.Range('d', 'z' - 'd' + 1)
                .Select(i => (char)i)
                .Zip(Enumerable.Range('a', 'w' - 'a' + 1).Select(i => (char)i),
                    (f, s) => new KeyValuePair<char, char>(f, s)
                )
                .Concat(Enumerable.Range('a', 'c' - 'a' + 1)
                    .Select(i => (char)i)
                    .Zip(Enumerable.Range('x', 'z' - 'x' + 1).Select(i => (char)i),
                        (f, s) => new KeyValuePair<char, char>(f, s)
                    )
                );
            foreach (var item in table)
            {
                enc = enc.Replace(item.Key, item.Value);
            }
            Console.WriteLine(enc);
        }
    }
}