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: Wrong Answer)

#include <bits/stdc++.h>
using namespace std;

int main(){
  int N;
  cin >> N;
  vector<string> S(N);
  
  int K=1;
  string tmp;
  
  for(int i=0; i<N; i++){
    cin >> tmp;
    for(int j=0; j<K; j++){
      if(i == 0){
        S[0] = tmp;
        break;
      }
      if(tmp != S[j]){
        S[K] = tmp;
        K++;
        break;
      }
    }
  }
  cout << K << endl;
}