1.2 KB | 1187 chars
"""
[16524: Database of Clients](https://www.acmicpc.net/problem/16524)
Tier: Silver 4
Category: data_structures, hash_set, implementation, parsing, string, tree_set, set
"""
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
SYS_INPUT = True
RECURSION_LIMIT = 10 ** 7
SET_RECURSION = False
BLANK = " "
if SET_RECURSION:
sys.setrecursionlimit(RECURSION_LIMIT)
inp = lambda : sys.stdin.readline().rstrip() if SYS_INPUT else input()
mii = lambda : [*map(int,inp().split())]
mfi = lambda : [*map(float,inp().split())]
ii = lambda : int(inp())
fi = lambda : float(inp())
isplit = lambda : inp().split()
p = print
def gcd(a, b): return gcd(b, a % b) if b > 0 else a
def lcm(a, b): return a * b // gcd(a, b)
def f(s):
s = s.replace(".", "")
if "+" in s:
s = s.split("+")[0]
return s
def solve():
n = ii()
l = [inp() for _ in range(n)]
d = {}
for i in l:
a, b = i.split("@")
if b not in d:
d[b] = set()
a = f(a)
d[b].add(a)
ans = 0
for v in d.values():
ans += len(v)
p(ans)
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()