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: Time Limit Exceeded)

using System;


    class MainClass
    {
    public static void Main(string[] args)
    {


        int N= int.Parse(Console.ReadLine());

        string[] S =new string[N];

        for(int i = 0; i <= N - 1; i++)
        {
            S[i]= Console.ReadLine();

        }

        int count = 1;

        for(int j = 1; j <= N - 1; j++)
        {
            bool dif =true ;

            for (int k = 0; k <= j-1; k++)
            {

                if (S[j] == S[k])
                {
                    dif = false;
                    break;


                }




            }

            if (dif)
            {
                count++;
            }
        }

        Console.WriteLine(count);

    }
}