The ornamental design for a bow of a ship, as shown and described.
FIG. 1 is a right side perspective view of a bow of a ship, the left side perspective view of the bow of the ship being a mirror image of the right side view;
FIG. 2 is the right side view, the left side view being a mirror image of the right side view;
FIG. 3 is a top view of the bow of the ship;
FIG. 4 is a bottom view of the bow of the ship; and,
FIG. 5 is a front view of the bow of the ship.
It will be understood that the dashed or dotted lines presented in the drawings are for illustration only, and do not form a part of the claimed design.