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

Q: wrVsKN, mOVsWo

A: Vs
****
Q: ylyLVUjsmMrXMFAPDGIZsHq, cYymMrXMFAPjm

A: mMrXMFAP
****
Q: bFpNfC, pzpNNZ

A:
pN
****