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: UTdardKNThdYrGKMqZPeg, mvrThdYrGKMlcCxBtak

A: ThdYrGKM
****
Q: CxYdgRyfHdGiaeJ, NYXdaGdgRyfHdGLiiHiBSu

A:
dgRyfHdG
****