
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
Kolya wrote a ten-digit number composed of different digits on the board. Sasha added one digit so that the resulting number is divisible by 9. What digit could Sasha have added?

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