R-4=N
"NROP" could be a typo for "NPRO", but not sure. "DLIHCRAR" – maybe "Cradilhar"? No. Wait, perhaps the user meant "CHARIDRL" or similar. Alternatively, maybe "DLIHCRAR" is a phonetic spelling or part of a larger code.
Maybe a different shift. Shift 4:
I-4=E
L-4=H
D-3=A
R-3=O