
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 right trapezoid, one of the non-rectangular vertex angles is divided into angles $x^\circ$ and $y^\circ$, where both angles are prime numbers and the total angle is $90^\circ$, find the least possible value of $y^\circ$.

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