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

[Q]: SUgXyznbUQRpiLUTlRb, jlnwLTnbUQRpioUFyJ
[A]: nbUQRpi


[Q]: cjDuPZOHjystHnF, okWVdUDuPZOHjSCaEecP
[A]: DuPZOHj


[Q]: TPIvDIsP, mLIvDpSW
[A]:
IvD