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

PnRypl, HvRydi
Ry

QvtDqzQiSknPbRCG, hVxHdqzQiSknPbumdpNIf
qzQiSknPb

FvHuowDX, CWHuonUe

Huo