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

Q: LeHzcEFc, WFzcExvJ

A: zcE
****
Q: BpGFyhLez, DfFyhuJY

A: Fyh
****
Q: SyyZbsduuiCzcMUc, CoLZTbsduuijDygB

A:
bsduui
****