
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
The product of the two 101-digit numbers 707,070,707,...,070,707 and 909,090,909,...,090,909 has thousands digit C and units digit D, and find the sum of C and D.

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