
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 $\triangle ABC$, the given conditions are $a= \sqrt {3},B=45 ^{\circ} $, and one condition is missing due to paper damage. The task is to find the angle $A$. Through deduction, the missing condition is determined to be the length of one side of the triangle, and the answer hints that $A=60^{\circ}$. Fill in the blank with the missing condition.

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