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.Linq;

public class Test
{
	public static void Main()
	{
		// my code goes here
		int n = int.Parse(Console.ReadLine());
		string s = Console.ReadLine();
		int l = s.Length;
		char[] c = new char[l];
		c = s.ToCharArray();
		int[] d = new int[l];
		for(int j=0;j!=l;j++){
			d[j] = (int)c[j];
			d[j] += n;
			if(d[j]>=91){
				d[j] -= 26;
			}
			c[j] = (char)d[j];
		}
		string ans = new string(c);
		Console.WriteLine(ans);
		
	}
}