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]: egYXVtCPvWxP, VMOolyVtCPvWjIx
[A]: VtCPvW


[Q]: IvMFOrJnkHlnJdi, XlKSTrJnkHlYC
[A]:
rJnkHl