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 N, i, tmp, j, flag, cnt=0;
    char c;
    scanf("%d", &N); scanf("%c", &c);
    char ch[N][11];
    for (i=0; i<N; i++) {
        scanf("%s", ch[i]);
        flag=0;
        for (j=0; j<i; j++) {
            tmp=strcmp(ch[i], ch[j]);
            if (tmp==0) {
                flag=1;
                break;
            }
        }
        if (flag==0) cnt++;
    }
    printf("%d\n", cnt);
    return 0;
}