If $\text{INSECT}$ is coded as $\text{JOTFDU}$, and $\text{HOUSEFLY}$ as $\text{IPVTFGMZ}$, then how will $\text{BUTTERFLY}$ be coded?

Let's investigate the alphabet transformation rule using the word $\text{INSECT}\to \text{JOTFDU}$:
* $I\stackrel{+1}{\to }J$
* $N\stackrel{+1}{\to }O$
* $S\stackrel{+1}{\to }T$
* $E\stackrel{+1}{\to }F$
* $C\stackrel{+1}{\to }D$
* $T\stackrel{+1}{\to }U$

The rule is to shift each character forward by exactly $+1$ position in the alphabetical sequence. We verify this rule with $\text{HOUSEFLY}\to \text{IPVTFGMZ}$ ($H\to I$, $O\to P$, etc.). Applying this $+1$ transformation to $\text{BUTTERFLY}$:

* $B\stackrel{+1}{\to }C$
* $U\stackrel{+1}{\to }V$
* $T\stackrel{+1}{\to }U$
* $T\stackrel{+1}{\to }U$
* $E\stackrel{+1}{\to }F$
* $R\stackrel{+1}{\to }S$
* $F\stackrel{+1}{\to }G$
* $L\stackrel{+1}{\to }M$
* $Y\stackrel{+1}{\to }Z$

Arranging these letters yields **$\text{CVUUFSGMZ}$ **.