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()
{
    int n, i, j, count=0;
    scanf("%d", &n);
    char a[n][11], temp[11];

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

    for(i=0; i<n; i++){
        for(j=i+1; j<n; j++){
            if(strcmp(a[i], a[j])==0){
                strcpy(a[j],"no");
            }
        }
    }

    for(i=0; i<n; i++){
        if(strcmp(a[i], "no")!=0){
            count++;
        }
    }

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