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]: jinzsW, SMnzaW
[A]: nz


[Q]: QBhOspdIoU, HHCDspdIfJWP
[A]:
spdI