while true do -- start infinite loop
	shell.run("clear")
	print (" Panic Room Door control 0.2v")
	print (" ----------------------------")
	print (" [1] Open Door ")
	print (" [2] Close Door ")
	print (" [3] Exit ")
	print (" [4] Shutdown Computer ")
	input = read()
	yes = "1"
	no = "2"
	yo = "3"
	la = "4"
	if input == yes then
		redstone.setOutput ("back", false)
		redstone.setOutput ("down", false)
		shell.run("startup") break -- break loop before continuing
	end
	if input == no then redstone.setOutput ("back", true)
		redstone.setOutput ("down", true)
		shell.run("startup")
		break -- break the loop before proceeding
	end
	if input == yo then
		sleep(0)
	end-- to avoid an error
	if input == la then
		sleep(1)
		os.shutdown()
	end
end -- end the loop