In a certain code language, 'EARLY' is written as 'ZNSCF' and 'GAUGE' is written as 'FIVCH'. How will 'INBOX' be written in that language?

YQCPJ

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

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THE LOGIC FOLLOWED HERE IS:

REVERSE  THE LETTER AND ALTERNATELY ADDED 1 AND 2

EARLY = YLRAE

E → ( +1 ) → Z

A → ( +2 ) → N

R → ( +1 ) → S

L → ( +2 ) → C

Y → ( +1 ) → F

AND

G → ( +1 ) → F

A → ( +2 ) → I

U → ( +1 ) → V

G → ( +2 ) → C

E → ( +1 ) → H

SIMILARLY

I → ( +1 ) → M

N → ( +2 ) → F

B → ( +1 ) → M

O → ( +2 ) → F

X → ( +1 ) → M