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

Q: biAihydBoNlzR, IAloNhydBolwUz

A: hydBo
****
Q: sEYtoQlG, XIstoQQPw

A: toQ
****
Q: CktDuaSjBaHJB, FPDrKzDuaSjBaDvhnbjB

A:
DuaSjBa
****