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

fn main() {
    let mut set = HashSet::new();
    let mut s = String::new();
    stdin().read_line(&mut s).ok();
    let n: usize = s.trim().parse().unwrap();
    s.clear();

    for _ in 0..n {
        let mut s = String::new();
        stdin().read_line(&mut s).ok();
        let t = String::from(s);
        set.insert(t);
    }

    println!("{}", set.len());
}