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 <string.h>

int main(void)
{
    int n=0,count=0;
    char str[200000][11]={};
    int flag[200000]={};

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

    for(int i=0;i<n-1;i++){
        if(flag[i]==0){
            for(int j=i+1;j<n;j++){
                if(strcmp(str[i],str[j])==0){
                    flag[j]=1;
                }
            }
            count+=1;
        }
    }
    if(flag[n-1]==0) count+=1;

    printf("%d",count);
    return 0;
}