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

[Q]: cZSEmdgP, YsSEmEIM
[A]: SEm


[Q]: IobjElBjKvpepE, kRulBjKvvxU
[A]: lBjKv


[Q]: ANAtkPHYAVhIGtlaP, wSYAVhIGtogCqtR
[A]:
YAVhIGt