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())
s = [0]*n
for i in range(n):
    s[i] = input()
dic = []
count = 1
for i in range(n):
    sw = 0
    if i == 0:
        dic.append(s[0])
    else:
        for name in dic:
            if str(name) == str(s[i]):
                sw = 1
        if sw == 0:
            dic.append(s[i])
            count += 1
print(count)