In a code language, if TALLER is written as 202612122218, then how will BENIGN be written in the same language?

Let's investigate the positions of the letters in TALLER:
T=20 (Forward position)

A=26 (Backward / Reverse position: 27−1=26)

L=12 (Forward position)

L=12 (Forward position)

E=22 (Backward / Reverse position: 27−5=22)

R=18 (Forward position)

Looking closely, the consonants (T,L,L,R) are represented by their regular forward positions:
T→20, L→12, L→12, R→18.
The vowels (A,E) are represented by their reverse positional values:
A→26, E→22.

Let's test this logic on BENIGN:

B (Consonant) → Forward position = 2

E (Vowel) → Reverse position =27−5=22

N (Consonant) → Forward position = 14

I (Vowel) → Reverse position =27−9=18

G (Consonant) → Forward position = 7

N (Consonant) → Forward position = 14

Putting it together: 2221418714.