def fun(s):
    if '@' in s:
        list_c= s.split('@')
        if '.' in list_c[1]:
            list_c[1]=list_c[1].split('.')
            if list_c[1][1].isalpha() and len(list_c[1][1])<=3:
                if list_c[1][0].isalnum():
                    if list_c[0].replace('-','').replace('_','').isalnum():
                        return True
    return False

import re
def fun(s):
    # return True if s is a valid email, else return False
    pattern = r'^[a-zA-Z0-9_-]+@[a-zA-Z0-9]+\.[a-zA-Z]{1,3}$'
    
    if (re.match(pattern, s)): return True
    else: return False

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)

import re

def fun(s):
    result = re.fullmatch(r'[a-z0-9_-]+@[a-z0-9]+\.[a-z]{1,3}', s, re.I)
    
    return True if result else False