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<bits/stdc++.h>
using namespace std;
#define all(v) v.begin(), v.end()
using in = int64_t;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define REP(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define Yes cout<<"Yes"<<endl 
#define No cout<<"No"<<endl
#define yes cout<<"yes"<<endl 
#define no cout<<"no"<<endl
#define vec(a,y,x)  vector<vector<char>> a (y,vector<char>(x))
const double PI=3.14159265358979323846;
const in MOD = 1000000007;
const in INF=1e18+7;
const int inf=1e9+7;
const vector<int> dx={1,0,-1,0};
const vector<int> dy={0,1,0,-1};

int main(){
  int n;
  cin>>n;
  vector<string> num={};
  int ans=1;
  rep(i,n){
    string a;
    cin>>a;
   
      num.push_back(a);
      
  }
  sort(all(num));
  for(int i=1;i<n;i++){
    if(num.at(i-1)!=num.at(i))
      ans++;
  }
  cout<<ans<<endl;
}