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

[Q]: iMwanJBuMdiZDL, kIafHeBuMdiZmKNA
[A]: BuMdiZ


[Q]: goyZUz, QryZlD
[A]: yZ


[Q]: InblhwbKOtAom, awhwbKObUTe
[A]:
hwbKO