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

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

def fun(s):

    try:
        username, rest = s.split('@')
        websitename, extension = rest.split('.')
        
    except ValueError:
        return False
    
    if not username.replace('-', '').replace('_', '').isalnum():
        return False
        
    if not websitename.isalnum():
        return False
        
    if not extension.isalpha() or not (1 <= len(extension) <= 3):
        return False

    return True

import re
def fun(s):
    p = r"^[a-zA-Z0-9_-]+@[a-zA-Z0-9]+\.[a-zA-Z]{1,3}$"
    return bool(re.match(p, s))
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)