
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
If $A$, $B$, and $C$ are nonzero digits, calculate the number of digits in the sum of the four whole numbers represented as:
\[
\begin{tabular}[t]{ccccc}
  2 & 1 & 4 & 7 & 8 \\
  & & A & 5 & 9 \\
  & & & B & 4 \\
  & & & C & 6 \\
  \hline
\end{tabular}
\]
A) 4
B) 5
C) 6
D) Depends on the values of A, B, and C

Present the answer in LaTex format: \boxed{Your answer}
user