
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
Six friends (Ada, Bea, Ceci, Dee, Edie, and Fay) were sitting in a movie theater in a row containing 6 seats, numbered 1 to 6 from left to right. During the movie, Ada went to the lobby to get some snacks. Upon her return, she observed the following changes:
- Bea moved one seat to the right.
- Ceci stayed in her seat.
- Dee moved two seats to the left.
- Edie and Fay switched seats.
Ada found an end seat empty when she returned. In which seat was Ada originally sitting?
A) 1
B) 2
C) 3
D) 4
E) 5

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