The ornamental design for a walkingstick, as shown and described.
FIG. 1 is a perspective view of a walking stick in accordance with the present invention.
FIG. 2 is a right side elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a top view thereof; and
FIG. 7 is a bottom view thereof.
FIG. 8 is a perspective view of a walking stick shown in the context of a different environment; and,
FIG. 9 is a right side elevational view of a walking stick in the context of a different environment.
The broken lines in the drawing views are included for the purpose of illustrating portions of the walking stick that form no part of the claimed design.