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 sc = new Scanner(System.in);
        long num = sc.nextLong();
		ArrayList<String> item = new ArrayList<String>();
		item.add(sc.next());
        
      	for(int i=0; i<num-1; i++){
          String getItem = sc.next();
          boolean flg = false;
          for(int j=0; j<item.size(); j++){
            if (getItem.equals(item.get(j))){
              flg = true;
            }
          }
          if(!flg){
            item.add(getItem);
          }
        }
      
      	System.out.println(item.size());
          
    }

}