In a certain code language, OPERATION is written as POFQBSJNO. How will INVISIBLE be written as in that language?

JMWHTHCKF

1   2    3    4   5    6   7     8    9  10  11  12  13

 A   B   C    D   E    F   G    H    I    J    K    L   M

 ↓    ↓    ↓    ↓    ↓     ↓   ↓    ↓     ↓   ↓    ↓    ↓    ↓

 Z   Y    X   W   V    U   T    S    R   Q   P    O   N

26  25  24  23  22  21  20  19  18  17  16  15  14

**********************************************************

THE LOGIC FOLLOWED HERE IS:

O → +1 → P

P → -1 → O

E → +1 → F

R → -1 → Q

A → +1 → B

T → -1 → S

I → +1 → J

O → -1 → N

N → +1 → O

SIMILARLY

I → -1 → J

N → +1 → M

V → -1 → W

I → +1 → H

S → -1 → T

I → +1 → H

B → -1 → C

L → +1 → K

E → -1 → F