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# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;

namespace Atcoder
{
	class Program
	{
		static void Main(string[] args)
		{


			//テンプレート
			//// 整数の入力
			//int a = int.Parse(Console.ReadLine());

			//// スペース区切りの整数の入力
			//string[] input = Console.ReadLine().Split(' ');
			//int b = int.Parse(input[0]);
			//int c = int.Parse(input[1]);

			//// 文字列の入力
			//string s = Console.ReadLine();

			////出力
			//Console.WriteLine(a + b + c + " " + s);

			//A

			//string[] input = Console.ReadLine().Split(' ');
			//int s = int.Parse(input[0]);
			//int w = int.Parse(input[1]);

			//if (s <= w)
			//{
			//	Console.WriteLine("unsafe");
			//}
			//else
			//{
			//	Console.WriteLine("safe");
			//}

			//Console.ReadLine();

			//B
			//string[] input = Console.ReadLine().Split(' ');
			//var a = Double.Parse(input[0]);
			//var b = Double.Parse(input[1]);
			//var c = Double.Parse(input[2]);
			//var d = Double.Parse(input[3]);

			//double p1 = Math.Ceiling(c / b);
			//double p2 = Math.Ceiling(a / d);

			//if (p1 <= p2)
			//	Console.WriteLine("Yes");
			//else
			//	Console.WriteLine("No");

			//Console.ReadLine();

			//C.
			int n = int.Parse(Console.ReadLine());
			string[] s = new string[n];

			for(int j = 0;j < n; j++)
			{
				var check = Console.ReadLine().ToLower();

				s[j] = check;
			}


			string[] answer = s.Distinct().ToArray();

			Console.WriteLine(answer.Length);
			Console.ReadLine();
		}
	}
}