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_imports)]
use num::integer::gcd;
use proconio::*;
use std::cmp::*;
use std::collections::VecDeque;
use std::collections::HashSet;
use std::ops::*;

fn main() {
   input! {
      n: usize,
      s: [String; n]
   }

   let mut set = HashSet::new();
   for s in s {
      set.insert(s);
   }
   println!("{}", set.len());
}