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 <iostream>
#include <string.h>
#include <vector>
#include <queue>
#include <cstdio>
#include <math.h>
#include <map>
#include <algorithm>
#include <deque>
#include <stack>
#include<set>
//#include <bits/stdc++.h>
#define lson l,mid,rt<<1

#define rson mid+1,r,rt<<1|1

const int N=1e5+100;
using namespace std;

typedef long long ll;
const int inf=0x3f3f3f3f;
const int mod=1e9+7;
map<string,int>mp;
int main()
{
    int n;cin>>n;
    string s;
    int ans=0;
    for(int i=1;i<=n;i++){
        cin>>s;
        if(!mp[s]) ans++,mp[s]=1;
    }
    cout<<ans;
    return 0;
}