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)

//author : raghav_0901

#include <bits/stdc++.h>
using namespace std;

void _main();
signed main(void){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);int t=1,i=0;
//cin>>t;
while (t--){
//cout<<"Case #"<<(++i)<<": ";

	_main();

}return 0;}

//------------------------------------------------------------------------------------


void _main(){
    int n;cin>>n;
    map<string,int> mp;
    for(int i=0;i<n;i++)
    {
        string s;cin>>s;
        mp[s]=1;
    }
    cout<<mp.size()<<endl;
    return;
}