boolean lefts
lefts = true
local ki = 100
local dep = 16
monitor = peripheral.wrap("bottom")
monitor.setTextScale(1)
monitor.write("Line 1 -> Terminal")
monitor.setCursorPos(1,2)
local i
i = 0

while true do
if i == 0 then
	  os.pullEvent("redstone") -- wait for a "redstone" event
		  if rs.getInput("right") then -- check the input
			redstone.setOutput("back", true)
			sleep(1)
			i = i + 1
			lefts = false
			monitor.setCursorPos(1,2)
			monitor.clearLine()
			monitor.write("Arrived! Departure in " + dep " sec.")
			ki = 100
		else
			monitor.setCursorPos(1,2)
			monitor.clearLine()
			monitor.write("Arrival in " + ki + "seconds")
			ki = ki - 1
		  end
else
	if i ~= 16 then
		if lefts then
			redstone.setOutput("back", false)
			redstone.setOutput("front", true)
			lefts = false
			else
			redstone.setOutput("back", true)
			redstone.setOutput("front", false)
			lefts = true
		end
		monitor.setCursorPos(1,2)
		monitor.clearLine()
		monitor.write("Arrived! Departure in " + dep " sec.")
		i = i + 1
		sleep(1)
	else
		redstone.setOutput("back", false)
		redstone.setOutput("front", false)
		redstone.setOutput("top", true)
		sleep(1)
		redstone.setOutput("front", false)
		i = 0
		dep = 16
	end
end
end