
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
On the board, the number \( 8^{n} \) is written. The sum of its digits is calculated, then the sum of the digits of the resulting number is again calculated, and so on, until a single-digit number is obtained. What is this number if \( n = 1989 \)?

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