Sucker v2

local function putItem(s)
	if s == "L" then
		turtle.turnRight()
		turtle.drop()
		turtle.turnLeft()
	elseif s == "R" then
		turtle.turnLeft()
		turtle.drop()
		turtle.turnRight()
	else
		turtle.turnLeft()
		turtle.turnLeft()
		turtle.drop()
		turtle.turnLeft()
		turtle.turnLeft()
	end
end

local function decide(l, r)
	turtle.select(1)
	local data = turtle.getItemDetail()
	local sizeL = table.getn(l)
	local sizeR = table.getn(r)
	for i=1,sizeL do
		if data.name == l[i] then
			putItem("L")
		end
	end
	for i =1,sizeR do
		if data.name == r[i] then
			putItem("R")
		end
	end
	putItem("F")
end

while true do
	turtle.select(1)
	if turtle.suck() then
		local sortL = {}
			sortL[1] = ""
		local sortR = {}
			sortR[1] = ""
		decide (sortL, sortR)
	end
end