static void Main(string[] args)
{
var n = ReadInt();
var s = Read();
var ans = "";
for (int i = 0; i < s.Length; i++)
{
var x = ABC.BinarySearch(s[i]);
ans += ABC[(x + n) % 26];
}
WriteLine(ans);
}
static void Main(string[] args)
{
var input = Console.In;
var output = Console.Out;
try {
Console.SetIn(File.OpenText("Problem.txt"));
var sw = new StringWriter();
Console.SetOut(sw);
var stopwatch = new Stopwatch();
stopwatch.Start();
ABC.Solve();
stopwatch.Stop();
Debug.WriteLine(stopwatch.Elapsed);
Debug.Write(sw.ToString());
} finally {
Console.SetIn(input);
Console.SetOut(output);
}
//Console.ReadKey();
}
