In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Q: HaIPcFXLhYDp, AdIPcFXtJdRE

A: IPcFX
****
Q: OFbCjZDoRRlLsMU, DcCjZDoRRtld

A: CjZDoRR
****
Q: odtlhVnsuTjXN, xllhVnsNl

A:
lhVns
****