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

Q: uqazNuZhdJhw, KbnrzNuZhBdp

A: zNuZh
****
Q: xMxyohPBlJIEBqghiMdBQPwq, xsBlJIEBqghlMosK

A: BlJIEBqgh
****
Q: LPewynVer, ABlwynrdk

A:
wyn
****