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 Rust (1.42.0) (judge verdict: Accepted)

use std::io;
use std::collections::HashSet;

fn main() {
	let mut buf = String::new();
	io::stdin().read_line(&mut buf).expect("");
	let n: i32 = match buf.trim().parse() {
		Ok(n) => n,
		Err(_) => panic!(""),
	};
	let mut set: HashSet<String> = HashSet::new();
	for num in 0..n {
		let mut buf = String::new();
		io::stdin().read_line(&mut buf).expect("");
		buf = buf.trim().to_string();
		set.insert(buf);
	}
	println!("{}", set.len());
}