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

Q: pYmzRnGPQVPrqPApKTyvaO, tNGPQVPrqPVTh

A: GPQVPrqP
****
Q: vMsEJRoLkWcmkuwNRz, ZmoLkWcmVZiBv

A: oLkWcm
****
Q: giOcjOAuwowCDOKUtM, nUEVjOAuwowEL

A:
jOAuwow
****