
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
Along a straight alley, 400 street lamps are placed at equal intervals, numbered consecutively from 1 to 400. Alla starts walking from the first lamp, and Boris starts walking from the 400th lamp, each with a constant but different speed. When Alla is at the 55th lamp, Boris is at the 321st lamp. At which lamp will they meet? If they meet between two lamps, provide the lower number of the two lamps as the answer.

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