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>
#include <string.h>

char S[200010][10];
int main(){
	int N;
	char cmp[10];
	int flag=1;
	scanf("%d\n",&N);
	int i,j,cnt=0;
	
	for(i=0;i<N;i++){
		scanf("%s",cmp);
		if(cnt==0){
			strcpy(S[cnt],cmp);
			cnt++;
		}
		else{
			for(j=0;j<cnt;j++){
				if(strcmp(cmp,S[j])==0){
					flag=0;
				}
			}
			if(flag==1){
				strcpy(S[cnt],cmp);
				cnt++;
			}
		}
		flag=1;
	}
	
	printf("%d\n",cnt);

	return 0;
}