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

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


[Q]: XYnCjAWPHHJ, gmCjAWPHpmwVsm
[A]: CjAWPH


[Q]: iPklzHpThv, LqlzHpqLa
[A]:
lzHp