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 JavaScript (Node.js 12.16.1) (judge verdict: Time Limit Exceeded)

// inputに入力データ全体が入る

function Main(input) {
	// 1行目がinput[0]
	input = input.split(/\n/);
	//文字列から10進数に変換
	var n = parseInt(input[0], 10);
  
   //itemsに順番に格納
    var items=[];
    for (var i=1; i<=n; i++){
    items.push(input[i]);
    }
  var filter_items= items.filter(function (x, i, self) {
  return self.indexOf(x) === i;
  });
  console.log(filter_items.length); 
}
//*この行以降は編集しないでください（標準入出力から一度に読み込み、Mainを呼び出します）
Main(require("fs").readFileSync("/dev/stdin", "utf8"));