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)

/*
      THINK  TWICE  CODE  ONCE
        KEEP   GOING   BI*CH
           NEVER GIVE UP
               3 R B
                . .
                 .
*/
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#define ll long long
#define bp  __builtin_popcount
#define pb push_back
using namespace std;
using namespace __gnu_pbds;
typedef tree<int,null_type,less<int>,rb_tree_tag, tree_order_statistics_node_update> indexed_set;
const int maxn=1e5+5;
const  double EPS = 1e-14;
const ll MOD = 1e9+7;

int main()
{
    ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#ifndef ONLINE_JUDGE
    freopen("in.txt", "r", stdin);
#endif
    int n;
    cin>>n;
    set<string>st;
    for(int i=0;i<n;i++)
    {
        string s;
        cin>>s;
        st.insert(s);
    }
    cout<<st.size();
}