
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
Write the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9 on three cards, with the requirement that for any two numbers on the same card, their difference is not on that card. Now, the first card already has the numbers 1 and 5, the second card has the number 2, and the third card has the number 3. What is the other number on the first card?

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