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 main()
{
	int i,j,n,cnt=1;
 	scanf("%d",&n);
  	char s[200001][11],tmp[11];
 	for(i=0;i<n;i++)
    {
    scanf("%s",&s[i]);
    }
  for(i=0;i<n-1;i++)
    for(j=i+1;j<n;j++)
      if(strcmp(s[i],s[j])>0)
      {
      strcpy(tmp,s[i]);
      strcpy(s[i],s[j]);
      strcpy(s[j],tmp);
      }
  for(i=0;i<n-1;i++)
  {
  if(strcmp(s[i],s[i+1])<0)
    cnt++;
  }
  printf("%d",cnt);
}