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]: PShMbsbexXGlpBuMMDZZS, sVqGxSexXGlpBxuHXoI
[A]: exXGlpB


[Q]: aSoScLynKlvhqHhycOYKAu, zxWbMInKlvhqHhycmxsmAXDp
[A]:
nKlvhqHhyc


