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: Time Limit Exceeded)

#include <stdio.h>
 
int main(void) {
    int length, i, j, c, count=1;
    scanf("%d", &length);
  	char str[length][20];
  	for(i=0;i<length;i++){
	  scanf("%s", &str[i]);
    }
    for(i=1;i<length;i++){
      c = 0;
      for(j=i-1;j>=0;j--){
      	if(strcmp(str[i],str[j])==0){
          break;
        }else{
          c++;
        }
      }
      if(c == i){
		count++;
      }
    }
  	printf("%d", count);
    return 0;
}