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

[Q]: TWVTGNBh, nEVTGWq
[A]: VTG


[Q]: jXbgnl, lUbglP
[A]: bg


[Q]: HtuKZFVUyiEeJtSojkyG, hnjLUyiEeJtSoJZ
[A]:
UyiEeJtSo