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

[Q]: IQIHqbEhpVuNATp, GIJIHqbEhpzWb
[A]: IHqbEhp


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


[Q]: wOJfDCmclHcRImzQic, GFsWfDCmclHcOMqgLxlk
[A]:
fDCmclHc