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>

#define N 200000

int upchar(const void* left, const void* right){
  return strcmp( (char*)left, (char*)right );
}

void main(){
  int n, cnt=1;
  char s[N][11];
  scanf("%d",&n);
  for(int i=0; i<n; i++)
    scanf("%s",&s[i]);

  qsort(s, n, sizeof(char)*11, upchar);
  
  for(int i=1; i<n; i++){
    if(strcmp( s[i-1], s[i] ) != 0)
      cnt++;
  }
  
  printf("%d",cnt);
}