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: Runtime Error)

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

struct wordlist{
	char word[10];
	struct wordlist *right;
	struct wordlist *left;
};

struct wordlist* add(char *word,struct wordlist *root){
	if(root==NULL){
		root=(struct wordlist*)malloc(sizeof(struct wordlist));
		strcpy(root->word,word);
		root->right=NULL;
		root->left=NULL;
	}else if(strcmp(root->word,word)>0){
		root->left=add(word,root->left);
	}else if(strcmp(root->word,word)<0){
		root->right=add(word,root->right);
	}
	return root;
}

int search(struct wordlist*root,char *word){
	if(root==NULL){
		return 1;
	}else if(strcmp(root->word,word)==0){
		return 0;
	}else if(strcmp(root->word,word)>0){
		search(root->left,word);
	}else if(strcmp(root->word,word)<0){
		search(root->right,word);
	}
}

int main(void){
	struct wordlist *root=NULL;
	int n,count=0;
	scanf("%d",&n);
	char s[n][10];
	for(int i=0;i<n;i++){
		if(n==0){
			scanf("%s",s[i]);
			root=add(s[i],root);
			count+=1;
		}else{
			scanf("%s",s[i]);
			add(s[i],root);
			count+=search(root,s[i]);
		}
	}
	printf("%d",count);
}