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>

int main()
{
  int n,sum=0;
  scanf("%d",&n);
  char s[n][10];
  for(int i=0;i<n;i++){
    scanf("%s",s[i]);
  }
  for(int i=0;i<n;i++){
    for(int j=0;j<n;j++){
        if(s[i]!=0&&s[j]!=0&&strcmp(s[i],s[j])==0&&i!=j){
          s[j][0]='0';
        }
      
    }
  }
  for(int i=0;i<n;i++){
    if(s[i][0]!='0')
      sum+=1;
  }
  printf("%d",sum);
  return 0;
}