Problem:
Score : 200 points

Problem Statement

We have a string S consisting of uppercase English letters. Additionally, an integer N will be given.

Shift each character of S by N in alphabetical order (see below), and print the resulting string.

We assume that A follows Z. For example, shifting A by 2 results in C (A \to B \to C), and shifting Y by 3 results in B (Y \to Z \to A \to B).

Constraints

0 \leq N \leq 26

1 \leq |S| \leq 10^4

S consists of uppercase English letters.

Input

Input is given from Standard Input in the following format:

N
S

Output

Print the string resulting from shifting each character of S by N in alphabetical order.

Sample Input 1

2
ABCXYZ

Sample Output 1

CDEZAB

Note that A follows Z.

Sample Input 2

0
ABCXYZ

Sample Output 2

ABCXYZ

Sample Input 3

13
ABCDEFGHIJKLMNOPQRSTUVWXYZ

Sample Output 3

NOPQRSTUVWXYZABCDEFGHIJKLM

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

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();

        Dictionary<string, int> dicDay = new Dictionary<string, int>();
        dicDay.Add("A", 0);
        dicDay.Add("B", 1);
        dicDay.Add("C", 2);
        dicDay.Add("D", 3);
        dicDay.Add("E", 4);
        dicDay.Add("F", 5);
        dicDay.Add("G", 6);
        dicDay.Add("H", 7);
        dicDay.Add("I", 8);
        dicDay.Add("J", 9);
        dicDay.Add("K", 10);
        dicDay.Add("L", 11);
        dicDay.Add("M", 12);
        dicDay.Add("N", 13);
        dicDay.Add("O", 14);
        dicDay.Add("P", 15);
        dicDay.Add("Q", 16);
        dicDay.Add("R", 17);
        dicDay.Add("S", 18);
        dicDay.Add("T", 19);
        dicDay.Add("U", 20);
        dicDay.Add("V", 21);
        dicDay.Add("W", 22);
        dicDay.Add("X", 23);
        dicDay.Add("Y", 24);
        dicDay.Add("Z", 25);

        var ret = string.Empty;
        foreach(var c in s)
        {
            var a = (n + dicDay[c.ToString()])%26;
            var b = dicDay.First(p => p.Value == a).Key;
          
            ret = string.Format("{0}{1}",ret,b);
        }

        Console.WriteLine(ret);
    }
}