while turtle.detect() do
  turtle.turnLeft()
end
while true do
  turtle.select(1)
  turtle.suck()
  turtle.turnRight()
  turtle.turnRight()
  if turtle.compareTo(16) then
    turtle.turnRight()
    turtle.drop()
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.turnLeft()
  else
    turtle.drop()
    turtle.turnLeft()
    turtle.turnLeft()
  end
  os.sleep(2)
end