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)

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

int main() {
  int amount, output = 0;
  scanf("%d", &amount);

  char kind[12], prevKind[12];
  for (int i = 0; i < amount; i += 1) {
    scanf("%s", kind);
    // 一発目は前の景品名が無いのでカウント+1
    if (i == 0) {
      output += 1;
    // 前の景品名と今回の景品名が同じだったらスルー
    } else if (strcmp(prevKind, kind) == 0) {
    // 前の景品名と今回の景品名が違ったらカウント+1
    } else {
      output += 1;
    }
    // これでこの回の入力に関しての処理は終わりなので、前の景品名として今回の景品名を登録
    strcpy(prevKind, kind);
  }

  printf("%d", output);
  printf("%c", '\n');

  return 0;
}