Problem:
Score : 300 points

Problem Statement

You drew lottery N times. In the i-th draw, you got an item of the kind represented by a string S_i.

How many kinds of items did you get?

Constraints

1 \leq N \leq 2\times 10^5

S_i consists of lowercase English letters and has a length between 1 and 10 (inclusive).

Input

Input is given from Standard Input in the following format:

N
S_1
:
S_N

Output

Print the number of kinds of items you got.

Sample Input 1

3
apple
orange
apple

Sample Output 1

2

You got two kinds of items: apple and orange.

Sample Input 2

5
grape
grape
grape
grape
grape

Sample Output 2

1

Sample Input 3

4
aaaa
a
aaa
aa

Sample Output 3

4

Solution in Python (3.8.2) (judge verdict: Time Limit Exceeded)

N = int(input())
Y = [[[] for _ in range(26)] for _ in range(10)]
# print(Y)
c = 0

for i in range(N):
    s = input()
    o = ord(s[0])-97
    l = len(s)
    if s not in Y[l-1][o]:
        Y[l-1][o].append(s)
        c += 1
# print(Y)
print(c)