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++ (Clang 10.0.0) (judge verdict: Accepted)

#include<iostream>
#include<vector>
#include<string>
using namespace std;
int main()
{
	int ans=1,i,n;
	cin >> n;
    string s;
    vector<string> vec;
	for (i=0;i<n;i++){
      cin >> s;
      vec.push_back(s);
    }
	sort(vec.begin(),vec.end());
    i=1;
    while(vec.size()>i){
      if (vec[i]!=vec[i-1]) ans++;
      i++;
    }

	cout << ans << endl;
	return 0;
}