import re
def fun(s):
    emailpattern=r"[a-zA-Z0-9-_]+@[a-zA-Z0-9]+\.[a-zA-Z]{,3}"
    isemail=re.fullmatch(emailpattern,s) 
    if isemail:
        return True
    else:
        return False
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)