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 Ruby (2.7.1) (judge verdict: Wrong Answer)

line = readlines.map(&:chomp)
 
n = line[0].to_i
type = 0
novel = []
 
for j in 1..n
  new = true
  for k in 1..novel.size
    if line[j] == novel[k-1]
      new = false
      break
    end
  end
  if new == true then
    type = type + 1
    novel.push(j)
  end
end
 
print type