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: Wrong Answer)

import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;
public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        List<String> list = new ArrayList<String>();
        int a = s.nextInt();
        int y = 0;
        for(int i = 0; i < a; i++){
            String g = s.nextLine();
            boolean exist = false;
            for(String h: list){
                if(h.equals(g)){
                    exist = true;
                }
            }
            if(!exist){
                y++;
                list.add(g);
            }
        }
        System.out.println(y);
    }
}