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 cmp_char(const void* a, const void* b){
    char *a_char = (char *)a;
    char *b_char = (char *)b;
    return strcmp(a_char, b_char);
}

int main(){

    int N;
    scanf("%d", &N);

    char S[N+1][10+1];
    int i;

    for( i = 1; i <= N; i++ ){
        scanf("%s", S[i]);
    }

    qsort( S, N, sizeof(S[0]), cmp_char );

    int ans = 1;
    for( i = 1; i <= N-1; i++ ){
        if( strcmp( S[i], S[i+1] ) != 0 ){
            ans += 1;
        }
    }

    printf("%d\n", ans);

    return 0;

}

/*
    int N;
    int i,j;
    int ans=1;
    int flag;

    scanf("%d", &N);

    char A[N+1][10+1];
    char S[10+1];

    scanf("%s", S);

    strcpy( A[1], S );

    for( i = 2; i <= N; i++ ){
        scanf("%s", S);

        flag = 0;
        for( j = 1; j <= ans; j++ ){
            if( strcmp( A[j], S ) == 0 ){
                flag += 1;
                break;
            }
        } 
        if( flag == 0 ){
            ans += 1;
            strcpy( A[ans], S );
        }
    }

    printf("%d\n", ans);

    return 0;

}

*/