
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
A professor is assigning grades to a class of 15 students. The available grades are A's, B's, C's, and D's. How many ways can the professor assign grades to all of his students?

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