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>
#include <math.h>

int main(void){
  int N;
  int cnt=0;
  scanf("%d",&N);
  char S[N][11];
  char L[N+1][11];
  for(int i = 0;i < N;i++){
    scanf("%s",S[i]);
    for(int k = 0;k <= cnt;k++){
      if(k<cnt&&strncmp(L[k],S[i],10)==0){
        k=cnt+1;
      }
      else{
        strcpy(L[k],S[i]);
        cnt++;
      }
    }
  }
  printf("%d",cnt);
  return 0;
}