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 <stdlib.h>
#include <string.h>
int cmp(const void *a, const void *b){
    return strcmp((char *)a, (char *)b);
}

int main(void){
    int n;
    char s[200005][10];
    int dif=0;
    scanf("%d",&n);

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

    qsort(s,n,sizeof(s[0]),cmp);

    for(int i=1;i<n;i++){
        if(strcmp(s[i-1],s[i])!=0){dif++;}
    }
    printf("%d\n",dif+1);
    return 0;
}