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

Q: nhGinCtvLartcMPhJwGRbpZNrq, iQJlFKayEartcMPhJwDRROB

A: artcMPhJw
****
Q: IIbJjQKWaoGKHGgWPcy, uNoMWaoGKHGqbnjmYQ

A: WaoGKHG
****
Q: NRdneuWdAN, bmGIeuWdXsh

A:
euWd
****