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

Q: vMsEJRoLkWcmkuwNRz, ZmoLkWcmVZiBv

A: oLkWcm
****
Q: QgkpBHsrfRYJCa, AdjbKLpBHsrfbpBC

A: pBHsrf
****
Q: EJwMwRpTuvPxUn, pPTRpTuvUuj

A:
RpTuv
****