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.*;


class Main{
	public static void main(String args[]){
		
		Scanner sc=new Scanner(System.in);
		
		int n=sc.nextInt();
		String[] kinds = new String[n];
		
		int ans=1;
		
		for(int i=0;i<n;i++){
			kinds[i] = sc.next();
		}
		
		Arrays.sort(kinds);
		
		for(int i=1;i<n;i++){
		  		
		//System.out.print(kinds[i]);
			if(kinds[i].equals(kinds[i-1])==false)ans++;
		}
		
		System.out.print(ans);
	}
}