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

Q: zfUPUDeKbCMQa, BkAJFJUDeKbCMZmkFu

A: UDeKbCM
****
Q: bUcuzFgsdfojVR, IdcuzFgsdMRgtMA

A: cuzFgsd
****
Q: GPRTAxmekyaQjUWpDn, jerawdekyaQjUWpgL

A:
ekyaQjUWp
****