
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
Sherlock Holmes and Dr. Watson find another suitcase with a three-digit combination lock, containing the message "AT RED DENS. SEND END RED: DEER." Dr. Watson suggests the problem $SEND + END + RED = DEER$, where each letter represents a distinct digit, and the word 'DENS' implies the problem is in a different base. What is the combination to open the lock, assuming it's the value of $RED$ in decimal digits?

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