Puzzle: In certain code FINE is written HGPC. How is SLIT written in that code ?

Puzzle: In certain code FINE is written HGPC. How is SLIT written in that code ?

Answer:
      +2
F --------> H
       -2
I --------->G
       +2
N--------->P
       -2
E --------->C

      +2
S--------->U
      -2
L--------->J
      +2
I---------->K
      -2
T--------->R