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

    char **str;

void sort(int num){
    char tmp[11];
    for(int i=1;i<num;i++){
        for(int j=1;j<num;j++){
            if(strcmp(str[j-1], str[j])>0){
                strcpy(tmp, str[j-1]);
                strcpy(str[j-1], str[j]);
                strcpy(str[j], tmp);
            }
        }
    }

}
int main(void){
    int N;
    int count=1;

    scanf("%d",&N);
    str=(char **)malloc(sizeof(char *)*N);
    for(int i=0;i<N;i++){
        str[i]=(char *)malloc(sizeof(char)*11);
    }
    for(int i=0;i<N;i++) scanf("%s",str[i]);    
    sort(N);
    for(int i=1;i<N;i++){
        if(strcmp(str[i],str[i-1])!=0) count++;
    }
    printf("%d\n",count);
    return 0;
}