
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
Fill in the corresponding braces with the following numbers: $2021$, $-1.7$, $\frac{2}{5}$, $0$, $-6$, $\frac{23}{8}$, $\frac{\pi}{2}$.  
Set of positive numbers: $\{ \_\_\_\_\_\_\ldots \}$;  
Set of integers: $\{ \_\_\_\_\_\_\ldots \}$;  
Set of negative fractions: $\{ \_\_\_\_\_\_\ldots \}$;  
Set of positive rational numbers: $\{ \_\_\_\_\_\_\ldots \}$.

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