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 (Clang 10.0.0) (judge verdict: Runtime Error)

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

typedef long long ll;

int main(){
    ll n,count=1;
    char s[n][11];
    scanf("%lld",&n);
    for(int i=0;i<n;i++) {scanf("%s",s[i]);}
    qsort(s,n,11,strcmp);
    for(int i=0;i<n-1;i++){
        if(strcmp(s[i],s[i+1])) count++;
    }
    printf("%lld",count);

    return 0;
}