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

[Q]: KJswoapnXz, EQswoaFyH
[A]: swoa


[Q]: ATmVEtUuZOgsBUuL, UMUuZOgsBPVT
[A]: UuZOgsB


[Q]: WHbWbUwAKYeWzWIiKq, VlvTvJQRbUwAKYeWzkMqE
[A]:
bUwAKYeWz