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

[Q]: HiEuutntEBpU, fdkqEuutntEBABdGZRND
[A]: EuutntEB


[Q]: yxJxNRLEnKGHziJtfb, KfReWhEnKGHzitzfPWzK
[A]: EnKGHzi


[Q]: QIsCGTbMM, MesCGTpi
[A]:
sCGT