
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
1. In one move, you can either add one of the digits of a number to the number itself or subtract one of the digits from the number (for example, from the number 142 you can get $142+2=144$, $142-4=138$, and several other numbers).

a) Is it possible to get the number 2021 from the number 2020 in a few moves?

b) Is it possible to get the number 2021 from the number 1000 in a few moves?

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