
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
There are 39 non-zero numbers written in a row. The sum of each pair of neighboring numbers is positive, and the sum of all the numbers is negative.

What is the sign of the product of all the numbers?

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