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

Q: SeXNqRAbKdLuWXgb, npsIWRAbKdLuUWSbvuS

A: RAbKdLu
****
Q: bjjsMtBzzXIgYWPBZmaDL, iTxktmvBzzXIgYWPhbAyBE

A: BzzXIgYWP
****
Q: sJRFPufsaWXNeu, AePufsafc

A:
Pufsa
****