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 <stdlib.h>
#include <string.h>
int main() {
    int N, i, j, k, count = 1;
    scanf("%d", &N);
    char **S = malloc(sizeof(char*) * N);
    for (i = 0; i < N; i++) {
        S[i] = malloc(sizeof(char) * 11);
        scanf("%s", S[i]);
    }
    qsort(S, N, sizeof(char) * 11, strcmp);
    for (i = 1; i < N; i++) {
        if(strcmp(S[i-1],S[i])) count++;
    }
    printf("%d\n", count);
    return 0;
}