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.io.*;
import java.util.*;
import java.util.Collection;
class Main
{
  public static void main(String args[])  throws java.lang.Exception
  {
    BufferedReader br= new BufferedReader (new InputStreamReader(System.in));
    int n=Integer.parseInt(br.readLine());
    HashSet<String> hs=new HashSet<String>();
    for(int i=0;i<n;i++)
     {
       String s=br.readLine();
       hs.add(s);
     } 
    System.out.println(hs.size());
   
   }
}