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

[Q]: XbjDHRCWxdPbhibUKn, SrpuPDHRCWxdPbKPWEXNWbZ
[A]: DHRCWxdPb


[Q]: mmDhYqPJC, qThYqxW
[A]: hYq


[Q]: qykMTInZcwwiV, CikITInZciggq
[A]:
TInZc