If 95474 is written as FBADA, then how is 96457 written?

Let's map the digits to the code letters given in the example:
From 95474 $\to$ FBADA:

* $9\to \text{F}$
* $5\to \text{B}$
* $4\to \text{A}$
* $7\to \text{D}$
* $4\to \text{A}$

Now, let's find the code for 96457 using the direct replacement values:

* $9\to \text{F}$
* $6\to \text{C}$ (following alphabetical order of mapping: if $4=\text{A},5=\text{B}$, then $6=\text{C}$)
* $4\to \text{A}$
* $5\to \text{B}$
* $7\to \text{D}$

Thus, 96457 translates to FCABD.