If $95474$ is written as $\text{FBADA}$, then how is $96457$ written?

Let's find the encoding pattern using alphabetical ranks ($\text{A}=1,\text{B}=2,\text{C}=3,\text{D}=4,\text{E}=5,\text{F}=6,\dots$):
* $9\to 9-3=6\to \text{F}$
* $5\to 5-3=2\to \text{B}$
* $4\to 4-3=1\to \text{A}$
* $7\to 7-3=4\to \text{D}$
* $4\to 4-3=1\to \text{A}$

The rule is to subtract $3$ from each digit and convert it into its respective alphabetical character. Applying this to $96457$:

* $9\to 9-3=6\to \text{F}$
* $6\to 6-3=3\to \text{C}$
* $4\to 4-3=1\to \text{A}$
* $5\to 5-3=2\to \text{B}$
* $7\to 7-3=4\to \text{D}$

The encoded string is $\text{FCABD}$.