If COMPUTER is coded as GKQLYPIN, what is code for SENATE?

In a letter-shift coding scheme, each letter of a word is moved a fixed number of steps forward or backward in the alphabet, and when a shift crosses past 'Z' or before 'A' it wraps around to the other end. When the shift amount alternates between consecutive letters (for example +4, then -4, then +4, and so on), that same alternating rule must be reapplied, letter by letter, to code any new word.

This alternating pattern is confirmed by the given example, where COMPUTER (8 letters) is coded as GKQLYPIN:

1. C is shifted 4 places forward to G.

2. O is shifted 4 places backward to K.

3. M is shifted 4 places forward to Q.

4. P is shifted 4 places backward to L.

5. U is shifted 4 places forward to Y.

6. T is shifted 4 places backward to P.

7. E is shifted 4 places forward to I.

8. R is shifted 4 places backward to N.

So the shift alternates +4, -4, +4, -4, ... starting with +4 on the first letter. Applying the same alternating rule to SENATE (6 letters):

1. S is shifted 4 places forward to W.

2. E is shifted 4 places backward to A.

3. N is shifted 4 places forward to R.

4. A is shifted 4 places backward, wrapping around past 'A' to the end of the alphabet, to W.

5. T is shifted 4 places forward to X.

6. E is shifted 4 places backward to A.

Putting these letters together gives WARWXA. Checking each step against the same alternating +4/-4 rule used for COMPUTER confirms the pattern holds consistently across every letter, so SENATE is coded as WARWXA.