Cazenovia Cemetery Cache Mystery Cache

The coords bring you to a cluster of 3 gravestones in this small cemetery. You will need to solve the puzzle below in order to get the coords to the final stage. As always, no night caching, and please be mindful of your surroundings and respectful of the cemetery.

Proceed to the starting coords. There is a group of 3 gravestones. The one on the left is somewhat difficult to make out. The one on the right is the husband. In the middle, is Mary, the wife. It is her stone that you need for the puzzle, but it's her husband's name that holds the key to the following puzzle:

S2, A2, A3, R

D2, A2, I, I

Congratulations to magoering and wyrmfatr for the shared FTF