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

Q: ftvxfhsnJEygzV, JYxSfhsnJnIqkW

A: fhsnJ
****
Q: xMxyohPBlJIEBqghiMdBQPwq, xsBlJIEBqghlMosK

A: BlJIEBqgh
****
Q: nnmtpGgnBe, yYLtpGgbTHR

A:
tpGg
****