A 5.21 mm high firefly sits on the axis of a thin lens A, and is 12.5 cm in front of it. Lens A has a focal length of 5.57 cm. Behind lens A there is another thin lens, lens B, with a focal length of 26.5 cm. The two lenses share a common axis and are 56.1 cm apart. How far s'B from lens B is the final image located?