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)

fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: i32 = n.trim().parse().unwrap();

    let mut m = std::collections::HashMap::<String, bool>::new();
    for _ in 0..n{
        let mut t = String::new();
        std::io::stdin().read_line(&mut t).ok();
        m.insert(t, true);
    }

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