Rubiks Receivers

rednet.open("right")
local x, y, difference
while true do
    if redstone.getInput("front") == true then
        x = os.clock()
        os.pullEvent("redstone")
        y = os.clock()
        difference = y - x
        if difference < 0.5 then
            rednet.send(219,"L")
        elseif difference > 0.5 then
            rednet.send(219,"L'")
        end
    end
    os.pullEvent("redstone")
end