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

[Q]: oZNKLmfxecDfkXEGFkRBYk, tReqkiExecDfkXEGtNZpJVRxC
[A]: xecDfkXEG


[Q]: nuwMzarLqoPvabJla, JKcrLqoPvabJNDCILGQ
[A]: rLqoPvabJ


[Q]: meNaobkiAY, pGaobklAur
[A]:
aobk