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: Wrong Answer)

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

int main()
{
 
  int n;
  
  scanf("%d",&n);
  
  char s[n][11];
  int i;
  
  for(i=0;i<n;i++)
  {
    scanf("%s",&s[i]);
  }
  
  int count=1;
  char tmp1[11]={},tmp2[11]={};
  
  strcpy(tmp1,s[0]);
  strcpy(tmp2,s[0]);
  for(i=0;i<n-1;i++)
  {
    if(strcmp(tmp1,s[i+1])!=0&&strcmp(tmp2,s[i+1])!=0)
    {
      count++;
      strcpy(tmp1,s[i+1]);
    }
  }
  
  printf("%d\n",count);
      
  return 0;
}