The ornamental design for a truck, as shown and described.
FIG. 1 is a right side view showing our new design.
FIG. 2 is a left side view thereof.
FIG. 3 is a rear view thereof.
FIG. 4 is a front view thereof.
FIG. 5 is a top plan view thereof.
FIG. 6 is a rear and right side perspective view thereof.
FIG. 7 is a front and right side perspective view thereof.
FIG. 8 is a rear and right side perspective view thereof, the windows and taillights of the present design shown in broken lines for illustrative purposes only and forming no part of the claimed design; and,
FIG. 9 is a front and right side perspective view thereof, the windows, headlights and taillights of the present design shown in broken lines for illustrative purposes only and forming no part of the claimed design.