stairs

local x = 1

function reverse()
   turtle.turnLeft()
   turtle.turnLeft()
end

term.write("Depth = ")
x = tonumber(read())

for i = 1,x do
   turtle.dig()
   turtle.forward()
   turtle.digUp()
   turtle.up()
   turtle.digUp()
   turtle.up()
   turtle.digUp()
   turtle.down()
   turtle.down()
   turtle.digDown()
   turtle.down()
end

reverse()

for i = 1,x do
   turtle.up()
   turtle.forward()
end