In a certain code language, 'STOPER' is written as 'XNTJJL' and 'GANOPY' is written as 'LUSIUS'. How will 'FITAND' be written in that language?

KCYUSX

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:

S → (+5) → X

S → (-6) → N

O → (+5) → T

P → (-6)  → J

E → (+5) → J

R → (-6)  → L

AND

G → (+5) → L

A → (-6) → U

N → (+5) → S

O → (-6)  → I

P → (+5) → U

Y → (-6)  → S

SIMILARLY

F → (+5) → K

I → (-6) → C

T → (+5) → Y

A → (-6)  → U

N → (+5) → S

D → (-6)  → X