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>
#include <stdlib.h>

void strsort(char *p, int a, int b){
    
    qsort(p, a, b, (int(*)(const void*, const void*))strcmp);
}

int main(void){

    int N = 0;
    int count = 0;
    scanf("%d", &N);

    char S[N][10];

    for (int i = 0; i < N; i++){
        scanf("%s", S[i]);
    }

    strsort((char *)S, sizeof(S) / sizeof(S[0]), sizeof(S[0]) / sizeof(S[0][0]));

    for (int j = 1; j < N; j++){
        if (strcmp(S[j], S[j - 1]) == 0){
            count++;
        } 
    }
    
    N -= count;
    printf("%d\n", N);

    return 0;
}