I claim the ornamental design for a bench, substantially as shown and described.
FIG. 1 is a perspective view of the front of the bench;
FIG. 2 is an elevation view of the front of the bench;
FIG. 3 is an elevation view of the rear of the bench;
FIG. 4 is an elevation view of one side of the bench;
FIG. 5 is an elevation view of one side of the bench;
FIG. 6 is a top plan view of the bench; and,
FIG. 7 is a bottom plan view of the bench.
The broken lines showing portions of the design in all figures is included for the purpose of illustrating environment and unclaimed features and forms not part of the claimed design.