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

Q: WlqGjLNrxXeUrKCZel, pDSsmNrxXeUrKCslBXBbRu

A: NrxXeUrKC
****
Q: BmwpAnWJ, klVwpAFw

A: wpA
****
Q: goyZUz, QryZlD

A:
yZ
****