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: DQVkAbWTTPhoBx, TeWTTPhonxcIKL

A: WTTPho
****
Q: iYqiZIWQTK, IHqiZIrcK

A:
qiZI
****