If the word 'SERENDIPITY' is written as 'TDSDOEHQHUZ' and the word 'GLABELLA' is written as 'HMZCDMMZ' in a certain code language, then for the word 'INTERROBANG', what will be the seventh letter from the right after coding?
(Note: If a letter goes beyond Z, continue from A, and if it goes before A, continue from Z.)

Let's analyze the coding pattern from the given examples:
**Case 1: SERENDIPITY $\to$ TDSDOEHQHUZ**

* $\text{S (Consonant)}\to +1\to \text{T}$
* $\text{E (Vowel)}\to -1\to \text{D}$
* $\text{R (Consonant)}\to +1\to \text{S}$
* $\text{E (Vowel)}\to -1\to \text{D}$
* $\text{N (Consonant)}\to +1\to \text{O}$
* $\text{D (Consonant)}\to +1\to \text{E}$
* $\text{I (Vowel)}\to -1\to \text{H}$
* $\text{P (Consonant)}\to +1\to \text{Q}$
* $\text{I (Vowel)}\to -1\to \text{H}$
* $\text{T (Consonant)}\to +1\to \text{U}$
* $\text{Y (Consonant)}\to +1\to \text{Z}$

**Case 2: GLABELLA $\to$ HMZCDMMZ**

* $\text{G (Consonant)}\to +1\to \text{H}$
* $\text{L (Consonant)}\to +1\to \text{M}$
* $\text{A (Vowel)}\to -1\to \text{Z}$
* $\text{B (Consonant)}\to +1\to \text{C}$
* $\text{E (Vowel)}\to -1\to \text{D}$
* $\text{L (Consonant)}\to +1\to \text{M}$
* $\text{L (Consonant)}\to +1\to \text{M}$
* $\text{A (Vowel)}\to -1\to \text{Z}$

Rule identified:

* Consonants are shifted by $+1$.
* Vowels are shifted by $-1$.

Applying this rule to INTERROBANG:

* $\text{I (Vowel)}-1=\text{H}$
* $\text{N (Consonant)}+1=\text{O}$
* $\text{T (Consonant)}+1=\text{U}$
* $\text{E (Vowel)}-1=\text{D}$
* $\text{R (Consonant)}+1=\text{S}$
* $\text{R (Consonant)}+1=\text{S}$
* $\text{O (Vowel)}-1=\text{N}$
* $\text{B (Consonant)}+1=\text{C}$
* $\text{A (Vowel)}-1=\text{Z}$
* $\text{N (Consonant)}+1=\text{O}$
* $\text{G (Consonant)}+1=\text{H}$

The encoded word is HOUDSSNCZOH.
Now, counting the 7th letter from the right side:

$$\begin{array}{ccccccccccc}\text{H}& \text{O}& \text{U}& \text{D}& \mathbf{S}& \text{S}& \text{N}& \text{C}& \text{Z}& \text{O}& \text{H}\\ 11& 10& 9& 8& 7& 6& 5& 4& 3& 2& 1\end{array}$$

The 7th letter from the right is S.