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

[EX Q]: GFhJafTV, waHhJaji
[EX A]: hJa

[EX Q]: UCbReSfuLcbzmBCl, snQRReSfuLcbzmjqVPSdpp
[EX A]: ReSfuLcbzm

[EX Q]: ChjayMEFEWmSzgG, kPMEFEWmlKvIVA
[EX A]:
MEFEWm