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: Accepted)

alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' #use a string like this, instead of ord()
N = int(input().strip())
def shifttext(shift):
    S = str(input('').upper()) #Input text here
    data = []
    for i in S: #iterate over the text not some list
        if i.strip() and i in alphabet: # if the char is not a space ""
            data.append(alphabet[(alphabet.index(i) + shift) % 26])
        else:
            data.append(i) #if space the simply append it to data
    output = ''.join(data)
    return output
print(shifttext(N))