Solution

India is coded as $JLGEF$.

Check the pattern:

$I\to J$ means $+1$

$N\to L$ means $-2$

$D\to G$ means $+3$

$I\to E$ means $-4$

$A\to F$ means $+5$

So, the pattern is:

$+1,-2,+3,-4,+5$

Now apply this to $ROME$:

$R+1=S$

$O-2=M$

$M+3=P$

$E-4=A$

Therefore,

$ROME=SMPA$