
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
Given that Mrs. Smith is 39 years old, and she has nine children with consecutive ages from 5 to 13 inclusive, find the digit that is not the age of one of Mrs. Smith's children.

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