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: Time Limit Exceeded)

#include <stdio.h>
#include <string.h>
#include <stdbool.h>

int main() {
  bool flag=false;
  int N=0,count=0;
  char S[200001][11]={""};
  scanf("%d",&N);
  for(int i=0;i<N;i++) {
    scanf("%s",S[i] );
    flag=false;
    for(int j=0;j<i;j++){
      if(!strcmp(S[i],S[j])){
        flag=true;
        break;
      }
    }
    if(!flag) count++;
  }
  printf("%d\n",count );
  return 0;
}