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>
 
int main(void) {
  int N, i, j, Ans;
  scanf("%d", &N);
  char S[N][10];
  Ans = N;
  for(i=0; i<N; i++) {
    scanf("%s",S[i]);
    for(j=0; j<i; j++) {
      if(strcmp(S[i],S[j])==0) {
        Ans -= 1;
        break;
      }
    }
  }
  printf ("%d", Ans);
  return 0;
}