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++ (GCC 9.2.1) (judge verdict: Accepted)

#include <iostream>
using namespace std;
#include<set>
int main(void){
    set<string> item;
    int n;
    cin >> n;
    //bool exist = false;
    int cnt = 0;
    for(int i = 0; i < n; i++){
        string str;
        cin >> str;
        set<string>::iterator iti = item.find(str); 
        if(iti == item.end()){
            item.insert(str);
            cnt++;
        }
    }
    cout << cnt << endl;
}