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: Accepted)

require 'pp'

# n件読み込んだ結果を文字列の配列で返却する
def gets_n_s_list
  n = gets.chomp.to_i
  array = []
  n.times do
    array.push(gets.chomp)
  end
  return n, array
end

N, s_list = gets_n_s_list
puts s_list.uniq.size