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;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication5
{
    class Program
    {
        static void Main(string[] args)
        {
            int shift = int.Parse(Console.ReadLine());
            string str = Console.ReadLine();
            string retstr = string.Empty;
            List<string> comp = new List<string> { "A", "B", "C", "D", "E", "F", "G"
            , "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"};
            foreach (var s in str)
            {
                for (int i = 0; i < comp.Count; i++)
                {
                    if (comp[i].CompareTo(s.ToString()) == 0)
                    {
                        if (i + shift >= 26)
                        {
                            retstr += comp[i + shift - 26];
                        }
                        else { retstr += comp[i + shift]; }
                        break;
                    }
                }
            }
            Console.WriteLine(retstr);
            Console.ReadLine();
        }



    }
}