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

[Q]: JXnHYuZvAYK, zhUYuZvASGhd
[A]: YuZvA


[Q]: jinzsW, SMnzaW
[A]: nz


[Q]: YgFeqwqOZ, fPeqwsja
[A]:
eqw