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

Q: jXqEDHTCxTiUAICWZJdpmYq, GBTCxTiUAICZKnLgZBXi

A: TCxTiUAIC
****
Q: YRLHFm, odLHCI

A: LH
****
Q: xdwaPhQm, fBwaPGkS

A:
waP
****