eALvvHcv

1import re
2
3N = int(input())
4
5Emails = dict()
6for i in range(N):
7    e = input()
8    res = re.findall(r"([\w\.\+]*)@([\w\.]*)", e)
9    login = res[0][0].lower()
10    addr = res[0][1].lower()
11    if addr == "gmail.com":
12        login = login.replace('.','')
13        login = login.split('+')[0]
14
15    _def = login+"@"+addr
16    if not (_def in Emails):
17        Emails[_def] = [i,[]]
18    Emails[_def][1].append(e)
19
20res = [(Emails[i][0],Emails[i][1]) for i in Emails]
21res.sort(key=lambda x:x[0])
22
23print(len(res))
24for i in res:
25    print(len(i[1]),*i[1])