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

Q: FgQsxN, UMQsIa

A: Qs
****
Q: dZJWBGoeoMepPoTg, pekBGoeoMeQP

A: BGoeoMe
****
Q: WFDbkctmGCIwMuFcEHnLoYsV, yWdamGCIwMuFcEfaMuLEE

A:
mGCIwMuFcE
****