
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

By extracting several consecutive digits from a multi-digit number, new numbers can be obtained. For example, from 123456, you can extract 1234, 345, 34, etc. If from a multi-digit number you can obtain 121, 1122, 2122, 2111, 221, and 1212, then this multi-digit number is at least how many digits?

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