
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
In a senior high school class, there are 56 students. Now, all students are randomly numbered, and a sample of 4 students is selected using systematic sampling. It is known that students numbered 5, 33, and 47 are in the sample. The number of the remaining student in the sample is ______.

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