The ornamental design for a ring, substantially as shown and described.
FIG. 1 is a top perspective view of a ring showing my new design.
FIG. 2 is a rear elevational view thereof.
FIG. 3 is a front elevational view thereof.
FIG. 4 is a left side elevational view thereof.
FIG. 5 is a right side elevational view thereof.
FIG. 6 is a top plan view thereof.
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a bottom perspective view thereof.
Stippling and tangency lines in the drawings represent the three-dimensional contours of the design, and are not intended to indicate surface decoration. The broken lines in the drawings illustrate portions of the ring and form no part of the claimed design.