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 ,i ,j ,k=0;
    char S[200010][10];

    scanf("%d" ,&N);

    for(i=0 ; i<N ; i++){
        scanf("%s", S[i]);
        if(i>0){
            for( j=0 ; j<i ; j++){
                if(strcmp(S[j] , S[i])==0){
                    k++;
                    break;
                };
            };
        };
    };

    printf("%d" ,N-k);


    return 0;
}