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

[Q]: TTagIJmzrOTdnKr, UONmtdHJmzrOTduWo
[A]: JmzrOTd


[Q]: mXHhaCEIwqwEZcz, JZPXbYHhaCEIwZmna
[A]: HhaCEIw


[Q]: lBmHvWQf, HPmHvnvz
[A]:
mHv


