startup

rednet.open("front")
l = 6
while true do
  evt, side = os.pullEvent("redstone")

  if side == "top" then
    rednet.send(l, "r")
  elseif side == "back" then
    rednet.send(l, "y")
  elseif side == "bottom" then
    rednet.send(l, "g")
  end
end