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: Wrong Answer)

int main(void)
{
  int i, j, N;
  int x=0;
  scanf("%d", &N);
  
  int S[N][11], y[N];
  
  for(i=0; i<N; i++)
    y[i]=0;
  
  for(i=0; i<N; i++)
    scanf("%s", S[i]);
  
  for(i=0; i<N-1; i++){
    for(j=i+1; j<N; j++){
      if(y[i]==0){
        if(S[i]==S[j]){
          x+=1;
          y[j]=1;
        }
      }
    }
  }
  printf("%d",N-x);
  return 0;
}