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

[Q]: QEEVsnbQIgrxaZmflaZ, dPSbljkdQIgrxaZmgVzMT
[A]: QIgrxaZm


[Q]: spUbdWDLWCeqr, vIuHkWDLWCQEPaz
[A]: WDLWC


[Q]: EyfVdwSWkXLFCyzGG, qVfVdwSWkXOOrsnlB
[A]:
fVdwSWkX