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: Time Limit Exceeded)

import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        int n=s.nextInt();
        s.nextLine();
        ArrayList l= new ArrayList();
        boolean t;
        String line;
        for(int i=0;i<n;i++){
            t=true;
            line=s.nextLine();
            for(int x=0;x<l.size();x++){
                if(l.get(x).equals(line)){
                    t=false;
                }
            }
            if(t) l.add(line);
            
        }
        System.out.println(l.size());
    }
}