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

class Program
{
    static void Main(string[] args)
    {
        var N = int.Parse(Console.ReadLine());
        var S = Console.ReadLine();

        var array = S.ToArray();

        foreach (var item in array)
        {
            Console.Write((char)('z' - item + 'a'));
        }
        Console.WriteLine();
    }
}