The ornamental design for a strap, as shown and described.
FIG. 1 is a perspective view of a strap showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The portions of the strap shown in large broken lines, with larger gaps between them, in the figures attached hereto form no part of the claimed design. The portions of the strap shown in smaller broken lines, with smaller gaps between them, are intended to show stitching, and form part of the claimed design.