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.*;

public class Main {
	static final int r = 1000000000 + 7;

	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		String s[] = new String[n];
		for (int i = 0; i < n; ++i)
			s[i] = sc.next();
		sc.close();
		int ans = 0;
		Arrays.sort(s);
		ans = 1;
		String st = s[0];
		for(int i = 1; i < n; ++i){
			String tmp = s[i];
			if(!st.equals(tmp)){
				st = tmp.substring(0);
				ans++;
			}
		}
		System.out.println(ans);
	}
}