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: Runtime Error)

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

int main(){
    int n,i,j,count=0,tmp=0;
    char s[300000][1000]={};
    char token[1000]={};
    fgets(token, sizeof(token), stdin);
    n=atoi(token);
    for (i=0; i<n; i++) fgets(s[i], sizeof(s[i]), stdin);
    for (i=0; i<n-1; i++) {
        tmp=0;
        for (j=i+1; j<n; j++) {
            if (strcmp(s[j], s[i])==0){
                tmp++;
                break;
            }
        }
        if (tmp==0) count++;
    }
    printf("%d",count);
    return 0;
}