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: Runtime Error)

// ABC164
// c.cs

using System;

class C
{
    public static void Main()
    {
        string[] str = Console.ReadLine().Split(' ');
        int N = int.Parse(str[0]);
        string[] S = new string[N];

        for (int i = 0; i < N; i++)
        {
            S[i] = str[i+1];
            //Console.WriteLine(S[i]);
        }

        Array.Sort(S);
        int num = 0;
        
        /*foreach(string str1 in S)
        {
            Console.WriteLine(str1);
        }*/

        for (int i = 0; i < N-1; i++)
        {
            if(string.Compare(S[i], S[i + 1]) == 0)
            {
                num++;
            }
        }
        Console.WriteLine(N-num);

    }
}