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: Accepted)

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
int main(void)
{
  int n;
  int i;
  int sum=1;
  scanf("%d",&n);
  char a[n][11];
   for(i=0; i<n; i++){
       scanf("%s",&a[i]);
   }

  qsort(a,n,11,strcmp);

  for(i=1;i<n;i++){
      if(strcmp(a[i],a[i-1])!=0) 
        sum++;    
  }
   
  printf("%d",sum);
  return 0;
}