The ornamental design for a bench, as shown and described.
FIG. 1 is a perspective view of a first embodiment of the bench of the present invention;
FIG. 2 is a front elevation view thereof, the rear elevation view being a mirror image thereof;
FIG. 3 is a right side elevation view thereof, the left side elevation view being a mirror image thereof;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a top plan view of a second embodiment, all of the other views of the second embodiment being a mirror image of the corresponding view of the first embodiment.
The broken lines shown in the drawings depict environmental features that form no part of the claimed design.