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 <stdlib.h>
#include <string.h>

int main()
{
  int n;
  char s[10];
  scanf("%d",&n);
  
  char *table[n];
  int *type[n];
  
  for (int i = 0; i < n; i++) 
  {
	scanf("%s", s);
    table[i]=(char *)malloc(sizeof(char)*(strlen(s)+1));
    strcpy(table[i], s);
    
    type[i] = (int *)malloc(sizeof(int));
    type[i] = -1;
  }
  
  int count;
  count=0;
  
  for(int i = 0; i < n-1; i++)
  {
     if(type[i] == -1)
     {
     	for(int k = i+1; k < n;  k++)
     	{
            if(type[k] == -1)
            {
       			if(strcmp(table[i], table[k])==0)
       			{
         			type[k] = i;
         			count++;
       			}
            }
     	}
     }
  }
  
  printf("%d\n", n-count);
  
  return 0;
}