
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 lanterns are placed at equal intervals, numbered consecutively from 1 to 400. Simultaneously, Alla and Boris start walking towards each other from opposite ends of the alley at different constant speeds, with Alla starting from the first lantern and Boris from the 400th lantern. When Alla reaches the 55th lantern, Boris is at the 321st lantern. At which lantern will they meet? If the meeting occurs between two lanterns, indicate the smaller number of the two.

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