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 z,i,N,s_count[200000],total=0,c[10],count,j;
	char s[10][200000][10],d[10];
	for(i=0;i<10;i++)c[i]=0;
	scanf("%d",&N);
	for(i=0;i<N;i++){
		scanf("%s",d);
		count=strlen(d);
		if(c[count-1]==0){
			for(j=0;j<count;j++){
				s[count-1][c[count-1]][j]=d[j];
			}
			c[count-1]++;
			total++;
		}else{
			for(j=0;j<c[count-1];j++){
				for(z=0;z<count;z++){
					if(d[z]!=s[count-1][j][z])break;
				}
				if(z==count)break;
			}
			if(j==c[count-1]){
				for(z=0;z<count;z++){
					s[count-1][j][z]=d[z];
				}
				c[count-1]++;
				total++;
			}
		}
	}
	printf("%d",total);
	return 0;
}