And the answer is:

Rightmost
Digit Character

+0 {
+1 A
+2 B
+3 C
+4 D
+5 E
+6 F
+7 G
+8 H
+9 I

-0 }
-1 J
-2 K
-3 L
-4 M
-5 N
-6 O
-7 P
-8 Q
-9 R