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 1.8.0) (judge verdict: Accepted)

/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Set<String> hash_Set = new HashSet<String>(); 
		int n;
		Scanner sc = new Scanner(System.in);
		n = sc.nextInt();
		String s;
		for(int i=0;i<n;i++) {
		    s = sc.next();
		    hash_Set.add(s);
		}
    //   Object[] objects = hash_Set.toArray(); 
  
    //     // Printing array of objects 
    //     for (Object obj : objects) 
    //         System.out.println(obj); 
    System.out.println(hash_Set.size());
	}
}