
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 were sitting in a row at a concert, in 6 seats numbered 1 to 6 from left to right. During the concert, Ada left her seat to buy a drink. While she was away:
- Bea moved one seat to the left.
- Ceci moved two seats to the right.
- Dee and Edie switched seats.
- Fifi moved three seats to the left, ending at seat 1.
When Ada returned, she took the only remaining seat at one of the ends. Identify Ada's original seat.
A) 1
B) 2
C) 3
D) 4
E) 5
F) 6

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