
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
Calculate the total difference $S = (2001 + 2004 + 2007 + \cdots + 2214) - (501 + 504 + 507 + \cdots + 714)$.
A) 107100
B) 108000
C) 109900
D) 111000

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