In a certain code 'WRITER' is written as 'SFUJSX'. How is 'DOCTOR' written in…

Concept: In this class of coding-decoding puzzles, the code word is produced by applying a fixed two-step transformation to the original word: first reverse the entire order of its letters, then shift every letter of that reversed word forward by a fixed number of places in the alphabet (a simple Caesar-style shift applied after reversal).

Applying the rule to the given example:

1. Reverse 'WRITER' to get 'RETIRW'.

2. Shift each letter of 'RETIRW' forward by one place: R→S, E→F, T→U, I→J, R→S, W→X, giving 'SFUJSX' — this matches the code given in the question, confirming the shift is exactly one place forward.

Now apply the same rule to 'DOCTOR':

1. Reverse 'DOCTOR' to get 'ROTCOD'.

2. Shift each letter of 'ROTCOD' forward by one place: R→S, O→P, T→U, C→D, O→P, D→E, giving 'SPUDPE'.

Cross-check: shifting every letter of 'SPUDPE' backward by one place gives 'ROTCOD', and reversing 'ROTCOD' returns 'DOCTOR', confirming the transformation is consistent in both directions.

So 'DOCTOR' is written as 'SPUDPE' in this code.