
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
Given that five friends are occupying seats 1 to 5 consecutively, and when Greg leaves, Iris moves one seat to the right, Jamal moves two seats to the left, and Kim and Leo switch seats, determine which seat was originally occupied by Greg.

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