The ornamental design for a cigar, as shown and described.
FIG. 1 is a perspective view of a cigar.
FIG. 2 is a front side view thereof.
FIG. 3 is a right side view thereof.
FIG. 4 is a left side view thereof.
FIG. 5 is a rear view thereof.
FIG. 6 is a top view thereof.
FIG. 7 is a bottom view thereof; and,
FIG. 8 is an exploded view thereof.
Each of the broken lines shown with dashes only in FIGS. 1-5 are included to show unclaimed subject matter only and form no part of the claimed design. The dash dot dash lines depict boundary lines and form no part of the claimed design.