A ladder of length L and mass M has its bottom end attached to the ground by

Question:

A ladder of length L and mass M has its bottom end attached to the ground by a pivot. It makes an angle ? with the horizontal, and is held up by a massless stick of length ? which is also attached to the ground by a pivot (see Fig). The ladder and the stick are perpendicular to each other. Find the force that the stick exerts on the ladder.