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-csc 3.5.0) (judge verdict: Accepted)

using System;
using System.Linq;
using System.Collections.Generic;
using System.IO;
using static System.Console;


namespace atcorder2
{
    class Program
    {
        public static long Read()
        {

            return long.Parse(Console.ReadLine());
        }

        public static long[] Reads()
        {


            return Console.ReadLine().Split().Select(long.Parse).ToArray();
        }

       
       
        public static long gcd(long x,long y)
        {
            if (x < y) gcd(y, x);
            
            while (y > 0)
            {
                var z = x % y;
                x = y;
                y = z;
            }
            return x;
        }

        public static long lcm(long x,long y)
        {
            return x * y / gcd(x, y);
        }



        static void Main(string[] args)
        {
            var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
            Console.SetOut(sw);


            var n = Read();
           
            var d = new Dictionary<string, long>();
            for (int i = 0; i < n; i++)
            {
                var str = ReadLine();
                if (d.ContainsKey(str))
                    d[str]++;
                else
                    d[str] = 1;
            }
            WriteLine(d.Count);
           
          
            Console.Out.Flush();
        }
    }
}