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.Scanner;
import java.util.ArrayList;

class Main{
      public static void main(String args[]){
	  Scanner sc = new Scanner(System.in);
	  int n = sc.nextInt();
	  String[] items = new String[n];
	  for(int i=0;i<n;i++){
	      items[i] = sc.next();
	  }
	  ArrayList<String> itemList = new ArrayList<>();
	  for(int i=0;i<n;i++){
	      if(itemList.size()>=1){
		  for(int j=0;j<itemList.size();j++){
		      if(items[i].equals(itemList.get(j))){
			  break;
		      }else if(j==itemList.size()-1){
			  itemList.add(items[i]);
		      }
		  }
	      }else{
		  itemList.add(items[i]);
	      }
	  }
	  System.out.println(itemList.size());
      }
}