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>
void main()
{
	int N, i, j;
	scanf("%d", &N);
	getchar();
	char str[20000][10];
	for (i = 0; i < N; i++)
		fgets(str[i],10,stdin);
	for (i = 0; i < N; i++)
		for (j = i+1; j < N; j++)
		{
			if (!strcmp(str[i], str[j]))
				N--;
		}
	printf("%d", N);
}