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 C
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            List<string> input = new List<string>();
            for(int i = 0; i < n; i++)
            {
                input.Add(Console.ReadLine());
            }
            var sorted = input.OrderBy(x => x).ToArray();

            int count = 0;
            
            if (sorted.Length > 0)
            {
                count++;
            }

            for(int i = 1; i < sorted.Length; i++)
            {
                if(sorted[i-1]!= sorted[i])
                {
                    count++;
                }
            }

            Console.WriteLine(count);
        }
    }
}