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?

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.

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).

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

见题面 Input 部分

见题面 Output 部分