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 fast ios_base::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL)
#define mod 1000000007
#define INF 1e9+5
#define endl "\n"
#define all(a) (a).begin(),(a).end()
#define lp(i,a,b) for(i=a;i<b;++i)
#define lpr(i,a,b) for(i=a;i>=b;i--)
#define F first
#define S second
#define pb push_back
#define mp make_pair

typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<string> vs;
typedef vector<pii> vii;
typedef vector<vi> vvi;

int main(){

  /*#ifndef ONLINE_JUDGE
  freopen("input.txt","r",stdin);
  freopen("output.txt","w",stdout);
  #endif*/

  fast;
  int i,j,tc,ip,n;
  cin>>tc;
  string s;
  set<string> st;
  while(tc--){
    cin>>s;
    st.insert(s);
  }
  cout<<st.size()<<endl;
  return 0; 
}