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

Q: zgJGhxLU, EwJGhedW

A: JGh
****
Q: CzkPtkpMTDeNZwCPbJJn, HzpMVDeNZwCPbJVOU

A: DeNZwCPbJ
****
Q: BMUqWsYximHhIVe, mWYximHhMb

A:
YximHh
****