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 Java (OpenJDK 11.0.6) (judge verdict: Accepted)

import java.util.*;
public class Main {
    public static void main(String[] args) {
    
    Scanner sc = new Scanner(System.in);
      
      //入力
      int N = sc.nextInt();//くじ引き回数
      String item[] = new String[N];
      int count =1;
      
      
      //景品を配列へ
      for(int i =0; i<N; i++){
      	item[i] = sc.next();
      }
      
      //景品を昇順に並び替え
      Arrays.sort(item);
      
      //景品が被っていたらカウント
      for(int i =0; i<N-1; i++){
        if(!item[i].equals(item[i+1])){
          count++;
        }
      }
      System.out.println(count);
    }
}