function moveDown(blocks)
	for i=1,blocks do
		turtle.down()
	end
end


function digAllUp()
	local i = 0
	while (turtle.detectUp()) do
		i = i + 1
		turtle.digUp()
		turtle.up()
	end
	return i
end

function digAllDown(blocks)
	for i=1,blocks do
		turtle.digDown()
		turtle.down()
	end
end

function digAllLine(amount)
	--dig up then dig down, and if theres an odd number go down when your done
	local j = 0
	for i=1,amount do
		if (i % 2 == 0) then
			digAllDown(j)
		else
			j = digAllUp()
		end
		turtle.dig()
		turtle.forward()
	end
	if(amount % 2 == 1) then
		moveDown(j)
	end
end

function turnNum(num)
	if (num == 1) then
		turtle.turnRight()
		turtle.dig()
		turtle.forward()
		turtle.turnRight()
	else
		turtle.turnLeft()
		turtle.dig()
		turtle.forward()
		turtle.turnLeft()
	end
end

function main(width, length)
	local side = 1
	for i=1,length do
		digAllLine(width)
		turnNum(side)
		side = side * -1
	end
end

print("width(forward):")
local width = tonumber(read())
print("length(right):")
local length = tonumber(read())

main(width, length)