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>

int main(){
  
  int n;
  int flag = 0;
  int count = 0;
  scanf("%d",&n);

  char s[n][10];
  char ans[n][10];

  for(int i=0; i<n; i++){
    scanf("%s",s[i]);
    for(int j=0; j<n; j++){
      if(strcmp(s[i],ans[j]) == 0){
        flag = 1;
      }else{
        /*何もしない*/
      }
    }
    if(flag == 0){
      strcpy(ans[count] , s[i]);
    count ++;
    }
    flag = 0;
    
  }

  if(count == 0){
    printf("1");
  }else{
    printf("%d",count);
  }

  return 0;
}