cxmYSZ7x

1#include <iostream>
2#include <unordered_map>
3#include <string>
4#include <vector>
5#include <algorithm>
6
7using namespace std;
8
9int main() {
10	unordered_map<string, vector <string>> my_map;
11	int n;
12	cin >> n;
13	string str;
14
15	for (int i = 0; i < n; i++)
16	{
17		cin >> str;
18		string newstring = "";
19		string strorigin = str;
20		transform (str.begin(), str.end(), str.begin(), ::tolower);
21		int pos = str.find('@');
22		if (str.compare (pos, str.size() - pos, "@gmail.com"))
23		{
24			int qold = 0;
25			if (int plus = str.find('+') != string ::npos)
26			{
27				string e = "";
28				str.replace(str.begin()+plus, str.begin()+pos-1, e.begin(), e.end());
29				pos = str.find('@');
30			}
31			while (int q = str.find('.', qold+1) != string :: npos && q != pos)
32			{
33				newstring += str.substr(qold+1, q-qold-1);
34				qold = q;
35			}
36		}
37		if (my_map.find(newstring) == my_map.end())
38		{
39			my_map[newstring] = vector<string>();
40		}
41		my_map[newstring].push_back(strorigin);
42	}
43	cout << my_map.size() << endl;
44	for (const auto &item0 :my_map)
45	{
46		cout << item0.second.size();
47		for (int i = 0; i < item0.second.size(); i++)
48		{
49			cout << ' ' << item0.second[i];
50		}
51		cout << endl;
52	}
53	return 0;
54}