In a certain code language, 'THEORY' is written as ‘YROEHT’ and ‘OPTION’ is written as ‘NOITPO’. How will 'EXPERT' be written in that language?

TREPXE

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 :

REVERSE THE ORDER OF ALPHABET

FIRST AND LAST INTERCHANGED WITH EACH OTHER

SECOND AND FIFTH INTERCHANGED WITH EACH OTHER

THIRD AND FOURTH  INTERCHANGED WITH EACH OTHER

AS

THEORY → INTERCHANGE → YROEHT

AND

OPTION → INTERCHANGE → NOITPO

SIMILARLY

EXPERT→ INTERCHANGE → TREPXE