
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 the parabola $C$: $y^{2}=4x$, with focus $F$, a line $l$ with slope $k(k > 0)$ passes through the point $P(-1,0)$ and intersects the parabola $C$ at points $A$ and $B$. The lines $AF$ and $BF$ intersect the parabola $C$ at points $M$ and $N$, respectively. If $\frac{|AF|}{|FM|}+\frac{|BF|}{|FN|}=18$, then $k=$ \_\_\_\_\_\_.

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