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

Q: rPPfxUdowLLdvwRtY, PuHovApkfxUdowLLBOhq

A: fxUdowLL
****
Q: spUbdWDLWCeqr, vIuHkWDLWCQEPaz

A: WDLWC
****
Q: XWeimRReUOAyPTvQa, fokHeMeimRReUOAywanW

A:
eimRReUOAy
****