turtle.select(16)

while true do
  if turtle.compare() then
    break
  else turtle.turnLeft()
  end
end

turtle.turnLeft()
turtle.turnLeft()

while true do
  if redstone.getInput("back") then
  if turtle.getItemCount(1) > 15 then
    turtle.turnLeft()
    for n=2,15 do
      turtle.select(n)
      if turtle.compareTo(1) then
        turtle.drop()
      end
    end
    turtle.select(1)
    turtle.drop(turtle.getItemCount(1)-1)
    turtle.turnLeft()
    turtle.turnLeft()
    for n=2,15 do
      turtle.select(n)
      if not turtle.compareTo(1) then
        turtle.drop()
      end
    end
    turtle.select(1)
    turtle.turnLeft()
  end
  turtle.attack()
  sleep(.1)
  turtle.suck()
  sleep(.1)
  else sleep(0.1)
  end
end