Right triangle ABC has , AB=8,BC=15 and AC=17. Square XYZW is inscribed in triangle ABC with X and Y on AC , W on AB , and Z on BC. What is the side length of the square?

Right triangle ABC has, AB=8, BC=15, and AC=17. Square XYZW is inscribed in triangle ABC with X and Y on AC, W on AB, and Z on BC. What is the side length of the square?