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: Accepted)

# s を一文字ずつ ord で文字コードに変換して n 分足し chr で文字列に元に戻し出力
# A..Z(65..90)

n = gets.to_i
s = gets.chomp.chars
ans = []

s.each do |i|
  if (i.ord + n) >= 91
    ans << (i.ord + n - 26).chr
  else
    ans << (i.ord + n).chr
  end
end

puts ans.join