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

[Q]: KvPFobZEGs, eKFobZEtnm
[A]: FobZE


[Q]: UiaECWZf, gRyaECWLGRl
[A]: aECW


[Q]: tHKpySevTUdtbnxvMyXBiuY, pRPTdlWUdtbnxvMyXmtPgbgI
[A]:
UdtbnxvMyX