The number of different digits in a natural number N is defined as shown in the figure.
Example: $4202 = 3$
Let A be a digit, and the equality shown in the figure holds.
What is the sum of different A values that satisfy the equality?
A) 8 B) 9 C) 10 D) 11 E) 12
The number of different digits in a natural number N is defined as shown in the figure.

Example: $4202 = 3$

Let A be a digit, and the equality shown in the figure holds.

What is the sum of different A values that satisfy the equality?

A) 8
B) 9
C) 10
D) 11
E) 12