def print_cal(day_of_week, month_len)
  days = %w(Mon Tue Wed Thu Fri Sat Sun)
  days.each { |day| print "#{day} " }

  puts

  day_num = 1
  month_started = false
  while day_num <= month_len
    (1..7).each do |i|
      if  day_of_week > i && month_started == false
        print '    '
      else
        month_started = true
        print ' ' if day_num < 10
        print " #{day_num} " if day_num <= month_len
        day_num += 1
      end
    end
    puts
  end
end