#!/bin/python3

import math
import os
import random
import re
import sys

#
# Complete the 'caesarCipher' function below.
#
# The function is expected to return a STRING.
# The function accepts following parameters:
#  1. STRING s
#  2. INTEGER k
#

def caesarCipher(s, k):
    # Write your code here
    # time is O(n)
    # incase k is larger than 26, we % so move is between 0 - 26
    move = k % 26
    result = []
    for letter in s:
        if letter.isupper():
            # ord() converts str to ACII num, and chr converts it back
            # - 65 so it goes from 0 - 26, % 26 so after adding move it's 
            # still within 26 letter range, + 65 to go back to ACII
            letter = chr((ord(letter) - 65 + move) % 26 + 65)
        elif letter.islower():
            # lower letter a starts at 97
            letter = chr((ord(letter) - 97 + move)% 26 + 97)
        result.append(letter)
        #combind letters in the arr result with "" (nothing) in between
    return "".join(result)
    

if __name__ == '__main__':
    fptr = open(os.environ['OUTPUT_PATH'], 'w')

    n = int(input().strip())

    s = input()

    k = int(input().strip())

    result = caesarCipher(s, k)

    fptr.write(result + '\n')

    fptr.close()