stairs

local depth = 0
term.write("Enter Depth: ")
depth = read()

for i = 0, depth do
  turtle.dig()
  turtle.forward()
  turtle.digUp()
  turtle.digDown()
  turtle.down()
end

turtle.up()
turtle.up()

for i =  0, depth do
  turtle.digUp()
  turtle.up()
  turtle.back()
 end