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 Python (3.4.3) (judge verdict: Wrong Answer)

n=int(input())
s_list=list(input())

alpha2num = lambda c: ord(c) - ord('A') + 1

def num2alpha(num):
    if num<=26:
        return chr(64+num)
    elif num%26==0:
        return num2alpha(num//26-1)+chr(90)    
    else:
        return num2alpha(num%26)

ans = []
for i in range(len(s_list)):
    num_ = alpha2num(s_list[i])
    ans.append(num2alpha(num_ + n))

ans_str = ''

if n == 0:
    for i in range(len(s_list)):
        ans_str += s_list[i]
    print(ans_str)
else:
    for i in range(len(ans)):
        ans_str += ans[i]
    print(ans_str)