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)

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# FileName: 	C
# CreatedDate:  2020-04-26 22:14:32 +0900
# LastModified: 2020-04-26 22:16:54 +0900
#


import os
import sys


def main():
    n=int(input())
    s = []
    count=0
    for i in range(n):
        chara = input()
        if not chara in s:
            s.append(chara)
            count+=1
    
    print(count)

if __name__ == "__main__":
    main()