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

[EX Q]: ljwjMioOwfOltGBaE, TneNGsoOwfOlxnWWW
[EX A]: oOwfOl

[EX Q]: CdRbREFMEDTXnEzgn, zHLEMMEDTXnEPH
[EX A]: MEDTXnE

[EX Q]: KVDrrLiJ, HZDrrLuaJ
[EX A]:
DrrL