
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
Consider a $3 \times 3$ matrix representing dates in a non-leap year February calendar from 21 to 27. First, the order of the numbers in the second row is reversed. Then, the numbers on each diagonal are added. Calculate the positive difference between the two diagonal sums.

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