
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
The Miss World contest has a long history of half a century. In a certain regional competition, there were 48 girls, their skin colors were either white or light black, and their eyes were either blue or brown. If 12 had blue eyes and white skin, 28 had light black skin, and 15 had brown eyes, and let the number of girls with brown eyes and light black skin be $a$, and the number of girls with white skin and brown eyes be $b$, then $a=$____, $b=$____.

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