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

Q: XjYkMfARxWBSBjuXyDrFt, EtUxIfiHkMfARxWBSckTLTTnR

A: kMfARxWBS
****
Q: ATmVEtUuZOgsBUuL, UMUuZOgsBPVT

A: UuZOgsB
****
Q: AgdLKZsZJdk, YuKZsZALU

A:
KZsZ
****