function getBlock()
  turtle.suckDown()
end

function checkSlot()
  if (turtle.getItemCount(1)) == 1 then
    turtle.drop()
  end
  if (turtle.getItemCount(1)) == 0 then
    getBlock()
  else
    turtle.place()
  end
end

function run()
  turtle.select(1)
  while true do
    checkSlot()
  end
end

run()