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

[EX Q]: WRfFDeZjIcpidmDxtaJcv, XMxWZjIcpidmlKga
[EX A]: ZjIcpidm

[EX Q]: DnAzbgMtdPKsNCMpBfc, QdfXRkWREzbgMtdPKsGx
[EX A]: zbgMtdPKs

[EX Q]: sUoIvVRBTdmjN, nTyZvVRBTdmcaVQF
[EX A]:
vVRBTdm