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

[Q]: gXwuhXJrEdzGOmLSKdK, TohXJrEdzGavU
[A]: hXJrEdzG


[Q]: BfCCzPNLBbwCoxMVAG, vhwNLBbwCbH
[A]: NLBbwC


[Q]: dRMPcoUWlGdhvVeFsjk, kYAUWlGdhvLjLNmV
[A]:
UWlGdhv