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

[Q]: CiTNsbepy, DFNsbeZl
[A]: Nsbe


[Q]: wrVsKN, mOVsWo
[A]: Vs


[Q]: etpSlttblTO, yJNIlttbsZ
[A]:
lttb