
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
A natural number has the sum of its digits subtracted from it. Then, one digit from the resulting difference is erased. The sum of the remaining digits of the difference is 131. Which digit was erased?

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