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: Runtime Error)

#include<stdio.h>
#include<string.h>

int main(void)
{
    int n,i,j,cnt=0;
    int d[10000]={0};
    char a[200100][10],tmp[20];
    scanf("%d",&n);
    for(i=0;i<n;i++){
        scanf("%s",a[i]);
    }
    for(j=1;j<n;j++){
        if(strcmp(a[j-1],a[j])>0){
            strcpy(tmp, a[j-1]);
            strcpy(a[j-1], a[j]);
            strcpy(a[j], tmp);
        }
    }
    for(i=0;i<n;i++){
        printf("%s\n",a[i]);
    }
    for(i=0;i<n;i++){
        if(strcmp(a[i],a[i+1])==0){
            d[cnt]++;
            cnt++;
        }
    }
    cnt=0;
    for(i=0;i<n;i++){
        if(d[i]!=0){
            cnt++;
        }
    }
    if(cnt==n){
        printf("1\n");
    } else{
        printf("%d",n-cnt);
    }
    return 0;
}