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: Runtime Error)

#include<stdio.h>
#include<string.h>

int main(void){
  int N,i,j,val_n;
  scanf("%d",&N);
  val_n=N;
  char S[N][10];
  for(i=0;i<N;i++)
    scanf("%s",S[i]);
  char temp[10];
  for(i=0;i<N-1;i++){
    for(j=N-1;j>i;j--){
      if(0>strcmp(S[j-1],S[j])){
	strcpy(temp,S[j-1]);
	strcpy(S[j-1],S[j]);
	strcpy(S[j],temp);
	}
    }
  }
  for(i=0;i<N-1;i++){
    if(0==strcmp(S[i],S[i+1]))
      val_n--;
  }
  printf("%d\n",val_n);
  return 0;
}