using System.Text;
using System;

public class Hello
{
    static void Main()
    {
        Console.ReadLine();
        var s = Console.ReadLine().Trim();
        var sb = new StringBuilder();

        foreach (var x in s) sb.Append(getC(x));
        Console.WriteLine(sb);
    }
    static char getC(char t)
    {
        var p = t - 'a';
        var res = (char)('z' - p);
        return res;
    }
}