import re
emailregex = re.compile(r'([a-zA-Z0-9_-]{1,})(@)([a-zA-Z0-9]+)(\.)([a-z|A-Z]{1,3})',re.VERBOSE)
def fun(emails):
    return bool(emailregex.fullmatch(str(emails)))

def filter_mail(emails):
    return list(filter(fun, emails))

if __name__ == '__main__':
    n = int(input())
    emails = []
    for _ in range(n):
        emails.append(input())

filtered_emails = filter_mail(emails)
filtered_emails.sort()
print(filtered_emails)