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(void){
	int n,i,j,ans=1,k=1;
	char a[200001][11];
	scanf("%d",&n);
	scanf("%s",a[0]);
	for(i=1;i<n;i++){
		scanf("%s",a[k]);
		for(j=0;j<k;j++){
			if(strcmp(a[k],a[j])==0){
				break;
			}
		}
		if(j==k){
			k++;
			ans++;
		}
	}
	printf("%d\n",ans);
	return 0;
}