JqpKD2dD

1from collections import defaultdict
2
3count = int(input()) # 6
4# emails = [ 
5#     "DEVELOPER.@gmail.com",
6#     "t+es+ter@GMAIL.COM",
7#     "T@bmail.com", 
8#     "a@gmail.com.ru", 
9#     "D.eveloper@Gmail.Com",
10#     "a+b@gmail.com.ru",
11# ] 
12emails = [input().strip() for _ in range(count)]
13
14def normalize(email):
15    mail, domen = email.lower().split('@')[:2]
16    if domen == 'gmail.com':
17        mail = mail.replace('.', '').split('+')[0]
18    return mail, domen
19    
20dic = defaultdict(list)
21    
22for email in emails:
23    dic[normalize(email)].append(email)
24    
25for email_list in dic.values():
26    print('{} {}'.format(len(email_list), ' '.join(email_list)))