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

import re

def fun(s):
    # return True if s is a valid email, else return False
    pattern = r"^[\w-]+@[a-zA-Z0-9]+\.[a-zA-Z]{1,3}$"
    if re.match(pattern, s) is None:
        return False
    else:
        return True

import re
def fun(s):
    try:
            username = s.split('@')[0]
            sec_part = s.split('@')[1]
            websitename = sec_part.split('.')[0]
            extension = sec_part.split('.')[1]
    except Exception:
        return False
    
    reg_username = r'^[a-zA-Z0-9_-]+$'
    reg_websitenane = r'^[a-zA-Z0-9]+$'
    reg_extension = r'^[a-zA-Z]{1,3}+$'


    if re.match(reg_username, username) is not None and re.match(reg_websitenane, websitename) is not None and re.match(reg_extension, extension) is not None:
        return True
    else:
        return False