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: Runtime Error)

import java.util.HashSet;
import java.util.Scanner;

class Main{
  public static void  main(String[]args){
    Scanner  sc=new Scanner(System.in);
    
    HashSet<Integer> hs=new HashSet<Integer>();
    
    int n=sc.nextInt();
    for(int i=0;i<n;i++)
      hs.add(sc.nextInt());
    
    System.out.println(hs.size());
  }
}