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<string.h>

void strCmp(char *ptr1,char *ptr2 ,char *tmp){
  
  
  if(strncmp(ptr1,ptr2,11) > 0){
    for(int i = 0; i<11;i++){
      tmp[i] = ptr1[i];
      ptr1[i] = ptr2[i];
      ptr2[i] = tmp[i];
    }
  }
}
  

int main(){
  int n,i,count=1;
  scanf("%d",&n);
  char s[n][11],tmp[11];
  //char* sp[n];
  for(i=0; i<n;i++){
    scanf("%s",s[i]);
   // sp[i] = &s[i][0];
    //printf("%s\n",s[i]);
  }
  
 // printf("\n");
  
  for(i = 0; i<n-1; i++){
    for(int j = i + 1; j<n; j++){
      strCmp(s[i],s[j],tmp);
    }
    //printf("%s\n",s[i]);
  }
  for(i=0;i<n-1;i++){
    if(strncmp(s[i],s[i+1],11) != 0) count++;
  }
     printf("%d",count);
}