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

Q: nYoRQU, gQoRZQ

A: oR
****
Q: WlqGjLNrxXeUrKCZel, pDSsmNrxXeUrKCslBXBbRu

A: NrxXeUrKC
****
Q: OKwFmBTHgDdcqQdR, vShGAqRFmBTHgDdIHm

A:
FmBTHgDd
****