count string matches

#!/usr/bin/env ruby
def check(correct, user_input)
  copy = correct.dup
  size = correct.size
  hit = 0
  user_input.chars.each do |c|
    begin
      copy[/#{c}/] = ''
      hit += 1
    rescue
      break
    end
  end
  hit * 100 / size
end
def qestion
  @word ||=<<-'EOS'.gsub(/\s+/,'').chars
    あいうえおぁぃぅぇぉかきくけこがぎぐげごさしすせそ
    ざじずぜぞたちつってとだぢづでどなにぬねのはひふへほ
    ばびぶべぼまみむめもやゆよわをん
  EOS
  5.times.map { @word.sample 1 }.flatten.join
end
def main
  1.times do
    q = qestion
    puts q
    user_input = gets.chomp
    puts "#{check(q, user_input)} point"
  end
end
main