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: Accepted)

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import java.util.*;
public class Main {
    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);
        int a=scan.nextInt();
        List<String> listA = new ArrayList<String>();
        for(int i=0;i<a;i++){
            String n=scan.next();
            //System.out.println(n);
            listA.add(n);
            //System.out.println("ListA = " + listA);
        }
        List<String> listB = listA.stream().distinct().collect(Collectors.toList());

       // System.out.println("ListA = " + listA);
        //System.out.println("ListB = " + listB);
        System.out.println(listB.size());
            }
        }