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

Q: VXSNlHzkB, EoNlHCiL

A: NlH
****
Q: eJPZzg, lFPZbI

A: PZ
****
Q: PjWFGSszKKsGFsZLcIK, LPzKKsGFsZWZT

A:
zKKsGFsZ
****