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)

//code by parshuram_84
#include<bits/stdc++.h>
#define mod 1000000007
#define pii pair<int,int>
#define pll pair<long long,long long>
#define IOS std::ios::sync_with_stdio(false); cin.tie(NULL);cout.tie(NULL);cout.precision(dbl::max_digits10);
#define pb push_back
#define mod 1000000007 //998244353
#define ll long long
#define vi vector<int>
#define vll vector<long long>
#define vp vector<pair<long long,long long>>
#define vpp vector<pair<pair<long long,long long>,long long>>
using namespace std;

int main() {
	int n,a,b,c,d,x=0,j,i;
	cin>>n;
	set<string> s;
	string p;
	for(j=0;j<n;j++)
	{
		cin>>p;
		s.insert(p);
	}
	cout<<s.size();
	return 0;
}