makeLadder

print("Place blocks in slot 1 and ladders in slot 2")
term.write("How high? ")
height = tonumber(read())

function place()
  while turtle.place() == false do
    turtle.attack()
    turtle.dig()
    turtle.place()
  end
end

for i = 1, height do
  turtle.select(1)
  place()
  turtle.back()
  turtle.select(2)
  place()
  turtle.up()
  turtle.forward()
end