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

Q: BfCCzPNLBbwCoxMVAG, vhwNLBbwCbH

A: NLBbwC
****
Q: NxgzLSzFGa, JvLzLSzsuj

A: zLSz
****
Q: oyUwTcHGV, WDisuUwTcHXioB

A:
UwTcH
****