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 PHP7 (7.0.15) (judge verdict: Accepted)

<?php
fscanf(STDIN, "%d", $behind_int);
fscanf(STDIN, "%s", $string);

$alpha_s = range('A','Z');
$str_splited_string = str_split(trim($string));
$result_string = "";

foreach ($str_splited_string as $key => $val) {
  $current_alphanum = array_search($val, $alpha_s);
  $next_alphanum = $current_alphanum + $behind_int;
  if ($next_alphanum > 25) {
    $next_alphanum = $next_alphanum % 26;
  }
  $result_string .= $alpha_s[$next_alphanum];
}

echo $result_string;