
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
It is necessary to erect some public welfare billboards on one side of a road. The first billboard is erected at the beginning of the road, and then one billboard is erected every 5 meters, so that exactly one billboard can be erected at the end of the road. In this case, there are 21 billboards missing. If one billboard is erected every 5.5 meters, also exactly one billboard can be erected at the end of the road, in this case, there is only 1 billboard missing. Then, there are     billboards in total, and the length of the road is     meters.

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