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

[Q]: vFuggVITQuctFG, hdCIWWuuggVITQwr
[A]: uggVITQ


[Q]: oCtWZYdkvZ, pkktWZYdEHMW
[A]: tWZYd


[Q]: kVSZWsYvyDoTtymhaBEaXwR, iMgQGYvyDoTtymhFwzAfdzM
[A]:
YvyDoTtymh