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.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

public class Main{

    public static void main(String[] args){
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        try {
            int number = Integer.parseInt(br.readLine());
            List<String> items = new ArrayList<>();
            int result = 0;
            for(int i = 0; i<number;i++){
                String now = br.readLine();
                if(items.contains(now)==false){
                    result++;
                }
                items.add(now);
            }
            System.out.print(result);
            br.close();
        }catch (IOException e){
            e.printStackTrace();
        }
    }
}