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)

# alpha = ('A'..'Z').to_a


n = gets.chomp.to_i

s = gets.chomp.downcase

# p alpha[n]

def chr2int(c)
	c.ord - 'a'.ord
end

def int2chr(i)
	(i + 'a'.ord).chr
end

def caesar(str, x)
	result = ""
	str.each_char{|c|
		result << int2chr((chr2int(c) + x) % 26)
	}
	result
end

puts caesar(s, n).upcase