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: Time Limit Exceeded)

using System;
using System.Collections.Generic;

public class TestC
{
    public static void Main(){     
        string times =　Console.ReadLine();
        string check = Console.ReadLine();
        string line = check;
        while(check != null)
        {
            line = line + " " + check;
            check = Console.ReadLine();
        }
        string[] items = line.Split(' ');
        List<string> getItem = new List<string>();
        int count = 0;

        for(int i = 0; i < items.Length; i++)
        {
            if(getItem.Contains(items[i]));
            else
            {
                count++;
                getItem.Add(items[i]);
            }
        }
        Console.WriteLine(count);
    }
}