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
while ($line = fgets(STDIN)) {
 $array[] = trim($line);
}
$num = $array[0];
$str = $array[1];

$abc = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
$len = strlen($abc);

$num = $num % $len;
if ($num == 0) {

echo $array[1];
} else if ($num < 0) {
$num = $num + $len;

$to = substr($abc . $abc, $num, $len);
$strv = strtr($str, $abc, $to);
$strv = strtr($str, strtoupper($abc), strtoupper($to));



            echo $strv;
          }
?>