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

Q: YCAyruPTTHWhCYaiXfIl, OETdzqAyruPTTHWgS

A: AyruPTTHW
****
Q: njzfcapS, JDzfcYQh

A: zfc
****
Q: rftJhGjFiCylduBPUQx, KKpQaXyzQFiCylduBPVPvsQZXm

A:
FiCylduBP
****