The ornamental design for a sandal, as shown and described.
FIG. 1 is a front right perspective view of a first embodiment of a sandal showing our new design;
FIG. 2 is front view of the design shown in FIG. 1;
FIG. 3 is a rear view of the design shown in FIG. 1;
FIG. 4 is a right side view of the design shown in FIG. 1;
FIG. 5 is a left side view of the design shown in FIG. 1;
FIG. 6 is a top view of the design shown in FIG. 1;
FIG. 7 is a bottom view of the design shown in FIG. 1;
FIG. 8 is front right perspective view of a second embodiment of a shoe showing our new design;
FIG. 9 is front view of the design shown in FIG. 8;
FIG. 10 is a rear view of the design shown in FIG. 8;
FIG. 11 is a right side view of the design shown in FIG. 8;
FIG. 12 is a left side view of the design shown in FIG. 8;
FIG. 13 is a top view of the design shown in FIG. 8; and,
FIG. 14 is a bottom view of the design shown in FIG. 8.
The figures include broken and solid. The areas within the solid lines form the claimed design. The broken lines shown in the figures are included for the purpose of illustrating environmental structure of the sandal and form no part of the claimed design.