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

[Q]: UIjAMFDuxDDGkfQa, VdsHuxDDGkfZHZZ
[A]: uxDDGkf


[Q]: mJoHBJehHtkFS, ZMrDxHBJehHtxS
[A]: HBJehHt


[Q]: YLlOpmfaX, ZIgvlOpmfKOkRt
[A]:
lOpmf