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)

#![allow(unused)]

use std::io::{Read, Stdin, StdinLock};
use std::iter::{FromIterator, Iterator};
use std::str::{FromStr};
use std::string::String;

macro_rules! debug {
    ($($a:expr),*) => {
	eprintln!(concat!($(stringify!($a), " = {:?}, "),*), $($a),*);
    }
}

struct TokenReader<'a> {
    lock: StdinLock<'a>,
}

impl<'a> TokenReader<'a> {
    fn new(s: &'a Stdin) -> TokenReader<'a> {
        TokenReader { lock: s.lock() }
    }

    fn read_chars<T: FromIterator<char>>(&mut self) -> T {
        self.lock
            .by_ref()
            .bytes()
            .map(|c| c.unwrap() as char)
            .skip_while(|c| c.is_whitespace())
            .take_while(|c| !c.is_whitespace())
            .collect::<T>()
    }

    fn read_str(&mut self) -> String {
        self.read_chars::<String>()
    }

    fn read<T: FromStr>(&mut self) -> T {
        self.read_str().parse().ok().unwrap()
    }
}

//==============================================================================
//
// Problem specific code
//
//==============================================================================

fn main() {
    let sin = std::io::stdin();
    let mut tr = TokenReader::new(&sin);

    let n: usize = tr.read();
    let mut ss: Vec<String> = (0..n).map(|_| tr.read()).collect();

    ss.sort();
    ss.dedup();
    println!("{}", ss.len());
}