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 n = 0;
    char s[200001][11] = { 0 };
    int count = 0;
    int i = 0, j = 0;

    scanf("%d", &n);

    for (i = 0; i < n; i++) {
        scanf("%*c%s", s[count]);
        if (i == 0) {
            count++;
            continue;
        }
        for (j = 0; j < count; j++) {
            if (s[j][0] != s[count][0])continue;
            if (strcmp(s[j], s[count]) == 0) {
                break;
            }
        }
        if (j == count)count++;
    }

    printf("%d", count);

    return 0;
}