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 C# (Mono-mcs 6.8.0.105) (judge verdict: Accepted)

using System;
using System.Collections;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Collections.Generic;
using System.Threading.Tasks;

class Program
{
	//Main
	static void Main(string[] args)
	{
		//読み込む
		int N = int.Parse(Console.ReadLine());

		//商品名を格納する配列
		string[] items = new string[N];

		//ループ処理
		for(int i=0; i<N; i++){
				string S = Console.ReadLine();
				items[i] = S;
		}

		//ソート
		Array.Sort(items, StringComparer.Ordinal);

		//一つ前と違う場合、カウンタをプラス
		int cnt = 1;
		if(N != 1){
				for(int i=1; i<N; i++){
						if(items[i-1] != items[i]){
								cnt ++;
						}
				}
		}

		Console.WriteLine(cnt);

	}
}