Cap

FIG. 1 is a top isometric view of an ornamental design for a cap;

FIG. 2 is a front elevational view of the cap of FIG. 1 , wherein a rear elevational view of the cap is identical to the front elevational view;

FIG. 3 is a top plan view of the cap of FIG. 1 ; and,

FIG. 4 is a bottom elevational view of the cap of FIG. 1 .

The broken lines in the drawings depict environmental subject matter only and form no part of the claimed design. Further, the bottom elevational view of FIG. 4 forms no part of the claimed design.