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)

N = int(input())
S = input()


def encrypt(S, N):
    X = ""

    for ch in list(S):
        if 'A' <= ch <= 'Z':
            X += chr((ord(ch) - ord('A') + int(N)) % 26 + ord('A'))
        elif 'a' <= ch <= 'z':
            X += chr((ord(ch) - ord('a') + int(N)) % 26 + ord('a'))
        else:
            X += ch

    return X

# 暗号化
X = encrypt(S, N)
print(X)