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

Q: slTUxy, oqTUYa

A: TU
****
Q: yxJxNRLEnKGHziJtfb, KfReWhEnKGHzitzfPWzK

A: EnKGHzi
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Q: uCefspxMqXjFjgtcEVprkkoTXXh, FoqjFjgtcEVprEnTa

A:
jFjgtcEVpr
****