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

[Q]: EPUxsZtt, KgxsZuXM
[A]: xsZ


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


[Q]: QjWYSolOMxuQolo, eZGacYSolOMxnxnckw
[A]:
YSolOMx