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

Q: xzMUdHcoYJFWLOILjrg, vCscoYJFWLzO

A: coYJFWL
****
Q: vMsEJRoLkWcmkuwNRz, ZmoLkWcmVZiBv

A: oLkWcm
****
Q: PEocsBzVbReIzDEN, xIblTJsBzVbRYqG

A:
sBzVbR
****