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

jsXHot, gtXHmB
XH

xMxyohPBlJIEBqghiMdBQPwq, xsBlJIEBqghlMosK
BlJIEBqgh

EYXWHfcSNIm, ANUWHfcNil

WHfc