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

Q: RwduMBkDazrwZP, UPzcwtWMBkDazrAw

A: MBkDazr
****
Q: DhhYhrqVMXSoyvXQwqPKzWARAP, CaMXSoyvXQwqcDDtMsVqD

A: MXSoyvXQwq
****
Q: qTGOmZBcIzQAmzKin, IbqnqnBcIzQAmzrqbYsnTZ

A:
BcIzQAmz
****