
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
Using five distinct digits, $1$, $4$, $5$, $8$, and $9$, determine the $51\text{st}$ number in the sequence when arranged in ascending order.
A) $51489$
B) $51498$
C) $51849$
D) $51948$

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