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: Time Limit Exceeded)

<?php
$box = [];
$num = trim(fgets(STDIN));

for($i=0;$i<$num;$i++) {
  $name = trim(fgets(STDIN));
  $id = array_search($name, $box);

  if($id !== FALSE) {
    $box[$id] = $box[$id]+1;
  } else {
    $box[$name] = 1;
  }
}

echo count($box);