using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(int n) => Enumerable.Repeat(0, n).Select(_ => NList).ToArray();
    static void Main()
    {
        var n = NN;
        var s = ReadLine();
        var res = new char[n];
        for (var i = 0; i < n; ++i) res[i] = (char)('z' - s[i] + 'a');
        WriteLine(string.Concat(res));
    }
}