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

Q: oZNKLmfxecDfkXEGFkRBYk, tReqkiExecDfkXEGtNZpJVRxC

A: xecDfkXEG
****
Q: BfCCzPNLBbwCoxMVAG, vhwNLBbwCbH

A: NLBbwC
****
Q: PSFLZWbbdURhRRkoHJJu, TjucPzbdURhRRkzYEJ

A:
bdURhRRk
****