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
/**
 * 標準入力　複数行
 */
// 標準入力を一行ずつ配列に代入します
while ($line = fgets(STDIN)) {
    $tmp[] = trim($line);
}

// 配列の各要素をさらに分解します
//foreach ($tmp as $key => $value) {
//    $array[] = explode(" ", $value);
//}

$times_drawing = $tmp[0];

$num_kind = 0;


for($i = 0 ; $i < $times_drawing; $i++){
    if(!isset($kinds)){
        $kinds[] = $tmp[$i + 1];
    }else{
        if(!in_array($tmp[$i + 1],$kinds)){
            $kinds[] = $tmp[$i + 1];
        }
    }
}

print(count($kinds));