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

fn read<T: FromStr>() -> Result<T, T::Err> {
    let mut tmp = String::new();
    stdin().read_line(&mut tmp).unwrap();
    tmp.trim().parse::<T>()
}

fn main() {
    let mut len_lines = read::<i32>().unwrap();
    let mut set = HashSet::new();
    let sin = stdin();
    while len_lines > 0 {
        let mut s = String::new();
        sin.read_line(&mut s).unwrap();
        set.insert(s);
        len_lines -= 1;
    }
    println!("{}", set.len());
}