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: Accepted)

import sys
import math
from collections import deque
input = lambda: sys.stdin.readline().rstrip()
Yes = lambda boolean: print('Yes') if boolean else print('No')
YES = lambda boolean: print('YES') if boolean else print('NO')
aint = lambda: int(input())
ints = lambda: list(map(int, input().split()))
is_even = lambda x: True if x%2==0 else False

n = aint()
get = []
for i in range(n):
    s = input()
    get.append(s)
ss = set(get)
print(len(ss))