santas_secret_helper

import re

key = int(input())
pattern = r"@([A-Za-z]+)[^\@\-!:>]*!(G|N)!"

while True:
    data = input()
    if data == "end":
        break
    text = ''.join([chr(ord(s)-key) for s in data])

    match = re.search(pattern, text)
    if match:
        name = match.group(1)
        behaviour = match.group(2)
        if behaviour == "G":
            print(name)