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

[Q]: njzfcapS, JDzfcYQh
[A]: zfc


[Q]: DhhYhrqVMXSoyvXQwqPKzWARAP, CaMXSoyvXQwqcDDtMsVqD
[A]: MXSoyvXQwq


[Q]: lMRuEThD, wqQRuEKp
[A]:
RuE