print "\e[?25l"

 rows, cols = `stty size`.split.map(&:to_i)


 drops = Array.new(cols) { rand(rows) }

 chars = ("0".."9").to_a + ("A".."Z").to_a + ("a".."z").to_a

 loop do
   cols.times do |i|



     5.times do |line|
       y = (drops[i] + line) % rows
       print "\e[#{y};#{i+1}H"
       print "\e[32m#{chars.sample}\e[0m"
     end

     drops[i] = (drops[i] + 1) % rows
   end

   sleep 0.05
 end

 at_exit { print "\e[?25h" }