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: Wrong Answer)

using System;
 
namespace Sample
{
  class Sample
  {
    static void Main(string[] args)
    {
    int N=int.Parse(Console.ReadLine());
      string[] str=new string[N];
      int ans=1;
      for(int i=0;i<=N-1;i++){
        str[i]=Console.ReadLine();

      }

            for(int i=0;i<=N-1;i++){
        for(int j=0;j<=i;j++){
          if(str[i]!=str[j]){
            ans+=1;
          }
        }
      }
      Console.WriteLine(ans);
  }

}
}