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 c(const void *a, const void *b){return strcmp((char*)b,(char*)a);}
int i,j,n,a[2000]={},b,r=1;
char s[200000][11];
int main(){
    scanf("%d",&n);
    for(i=0;i<n;i++)scanf("%s",s[i]);
    qsort(s,n,11,c);
    for(i=0;i<n-1;i++){printf("%s\n",s[i]);if(strcmp(s[i],s[i+1])!=0)r++;}
    printf("%d",r);
    return 0;
}