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 Ruby (2.3.3) (judge verdict: Wrong Answer)

N = gets.to_i 
S = gets.chomp

=begin
文字列を一文字ずつnextメソッドで入力された整数 N 分アルファベットを進めて
代入していく。
=end

str=""

S.length.times do |i|
    c = S[i]
    num = 0

    p c
    while num < N
        c.next!
        if c=="AA"
            c="A"
        end
        num+=1
    end

    str+=c

end

p str