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 <math.h>
#include <string.h>

int main(void)
{
  char s[200000][11];
  long int n,i,j,c=0;

  scanf("%ld",&n);
  for(i=0;i<n;i++)
  {
    c++;
    scanf("%s",s[i]);
    for(j=0;j<i;j++)
    {
      if(strncmp(s[i],s[j],10)==0)
      {
        c--;
        break;
      }
    }
  }

  printf("%ld\n",c);

  return 0;
}