
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
Given an ellipse with equation $\frac{x^2}{4} + y^2 = 1$, whose foci are $F_1$ and $F_2$, find the distance from a point $M$ on the ellipse that satisfies the condition $\vec{F_1M} \cdot \vec{F_2M} = 0$ to the y-axis.

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