In a certain code, TWINKLE is written as SVHOJKD, then how would FILTERS be written in the same code?

In a certain code, TWINKLE is written as SVHOJKD, then how would FILTERS be written in the same code? Correct Answer EHKUDQR

Each letter in the word, except the middle letter, is moved one step backward while the middle letter is moved one step forward to obtain the corresponding letter of the code.

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