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 PHP (7.4.4) (judge verdict: Accepted)

<?php

    // AtCoder Beginner Contest 164
    // C - gacha

    $n = in();
    $result = [];
    for ($i = 0; $i < $n; $i++) {
        $s = in();
        $result[$s] = true;
    }
    out(count($result));


    // -----------------------------------------------------
    function in() { return trim(fgets(STDIN)); }
    function in_int() { return (int)in(); }
    function in_vals() { return explode(' ', in()); }
    function in_ints() { return array_map('intval', in_vals()); }
    function out($s) { echo $s . PHP_EOL; }
    function yes() { out('Yes'); }
    function no() { out('No'); }