
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, there are 400 streetlights placed at equal intervals, numbered consecutively from 1 to 400. At the same time, Alla and Boris set out towards each other from opposite ends of the alley with different constant speeds (Alla from streetlight number 1 and Boris from streetlight number 400). When Alla was at the 55th streetlight, Boris was at the 321st streetlight. At which streetlight will they meet? If the meeting occurs between two streetlights, indicate the smaller number in your response.

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