If $95474$ is written as $\text{KGFIF}$, then how will $82143$ be written?

Let's map the correspondence between digits and letters based on alphabetical rankings or given substitution keys:
From $95474\to \text{KGFIF}$:

* $9\to K$ (since rank of $K=11$, it is $9+2$)
* $5\to G$ (since rank of $G=7$, it is $5+2$)
* $4\to F$ (since rank of $F=6$, it is $4+2$)
* $7\to I$ (since rank of $I=9$, it is $7+2$)
* $4\to F$ (since rank of $F=6$, it is $4+2$)

The system maps each digit $d$ to the letter whose alphabetical index position is $d+2$. Let's execute this rule for the target digits $82143$:

* $8\to 8+2=10\to J$
* $2\to 2+2=4\to D$
* $1\to 1+2=3\to C$
* $4\to 4+2=6\to F$
* $3\to 3+2=5\to E$

Putting these characters together produces **$\text{JCDFE}$ **.