local slotChanged = false

while true do
  turtle.attack()
  turtle.suck()
  for i = 1, 4 do
    if turtle.getItemCount(i) > 0 then
      turtle.select(i)
      turtle.dropDown()
      slotChanged = true
    end
  end
  if slotChanged then
   turtle.select(1)
  end
  sleep(.1)
end