
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
(2011 Beijing Xicheng District Assessment) Given the number sequence: 2, 5, 7, 8, 15, 32, 18, 12, 52, 8. Write an algorithm to search for the number 18 in this sequence.

Step 1, input a real number $a$.

Step 2, __________.

Step 3, output $a=18$.

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