def main
  loop do
    secret_number = rand(0..99)
    hint_0 = secret_number - rand(0..49)

    loop do
      say "#{secret_number - hint_0} + #{hint_0} is", newline: false
      print '?: '
      begin
        answer = Integer($stdin.readline.strip)
        if answer == secret_number
          say 'You got it!'
          break
        else
          say 'That is so incorrect!'
        end
      rescue => e
        $stderr.puts e
        say 'NO, Human!'
      end
    end

    say 'Do you want to play again? ', newline: false
    print '[Y/n] '
    if $stdin.readline.strip.downcase =~ /^n/
      say 'Goodbye, Human!'
      break
    end
  end
end

def say(msg, newline: true)
  print msg
  print "\n" if newline
  system "say -v ralph #{msg.inspect}"
end

main