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() {
    int times; // クジの回数.
    scanf("%d", &times);
    int count = 0; // 景品の種類の数.
    char str[times][10]; // 景品を格納する配列.

    for(int n = 0; n < times; n++) {
        scanf("%s", str[n]);
        int duplicate = 0; // 重複している数.
        for(int m = 0; m < n; m++) { // 今までの入力と比較する.
            if(strcmp(str[m], str[n]) == 0) duplicate++;
        }
        // 重複がない場合はカウント. 
        if(duplicate == 0) count++;
    }
    printf("%d\n", count);
}