
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 had the sum of its digits subtracted from it. From the resulting number, the sum of its digits was subtracted again, and so on. After eleven such subtractions, the result was zero. What was the starting number?

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