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 PHP (5.6.30) (judge verdict: Wrong Answer)

<?php

$num = fgets(STDIN);
$str = fgets(STDIN);

$list = range('A','Z');
$array = str_split($str);
$string = "";

foreach($array as $value){
    $key = array_search($value,$list);
    if($key+$num <= 25){
        $string .= $list[$key + $num];
    }else{
        $string .= $list[$key + $num -26];
    }
}
echo $string;
?>