
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
A whole number is written on the board. Its last digit is noted, then erased, and multiplied by 5, and then added to the remaining number on the board after the erasure. Initially, the number $7^{1998}$ was written. Can the number $1998^{7}$ be obtained after several such operations?

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