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<math.h>
#include<stdlib.h>
#include<string.h>

char S[100000*2][10];

int comp(const void* a, const void* b){
    return strcmp((char *)a, (char *)b);
}

int main(void){
    int N;
    int i;
    scanf("%d", &N);
    for(i=0;i<N;i++){
        scanf("%s", S[i]);
    }
    int a[100000*2];
    for(i=0;i<N;i++){
        a[i]=i;
    }

    qsort(S, N, sizeof(*S), comp);

    int ans = 1;
    for(i=1;i<N;i++){
        if(strcmp(S[a[i-1]], S[a[i]]) != 0){
            ans++;
        }
    }
    printf("%d", ans);

    return 0;
}