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

Q: jJSSBmflUyrEMLjSycA, YkmujkSSBmflUyrKKJZ

A: SSBmflUyr
****
Q: BeEgLISxThm, UGLISxEtP

A: LISx
****
Q: IaDTAvHkjZhEQSiO, wrnqLETAvHkjZjWDm

A:
TAvHkjZ
****