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>
int main(){
int a,b,i;
int k=0;
scanf("%d",&a);
char s[a];
char l[a];
for(i=0;i<a;i++){
	scanf("%s",&s[i]);
	l[i] = 0;}
for(i = 0;i < a;i++){
	for(b = i;b < a;b++){
			if(b != i){
			if(s[i] == s[b]) l[i] = s[i];}
			}
			}
for(i=0;i<a;i++){
  for(b = 1;b<a-i;b++)
	if(l[i] != l[i+b])k++;}
printf("%d",k);
}