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)

n = int(input())
list = []

# for _ の"_"はこの変数を使いませんよ、という意味.
for _ in range(n):
    s = input()
    #appendで追加.
    list.append(s)
new_list = sorted(list)
ans = n
for i in range(n - 1):
    if new_list[i] == new_list[i + 1]:
        #ans--はpythonで不可能.
        ans -= 1
print(ans)