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)

/*
 * FileName:     C
 * CreatedDate:  2020-04-26 21:11:54 +0900
 * LastModified: 2020-04-26 21:22:34 +0900
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(void){
    int n;
    scanf("%d",&n);
    char str[n][11];
    int flag=0,count=0;
    memset(str,'\0',sizeof(str));
    for(int i=0;i<n;i++){
        scanf("%s",str[i]);
        for(int j=0;j<i;j++){
            if(strcmp(str[i],str[j])==0){
                flag=1;
                break;
            }
        }
        if(flag==0){
            count++;
        }
        flag=0;
    }
    printf("%d\n",count);
    return 0;
}