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

Q: biAihydBoNlzR, IAloNhydBolwUz

A: hydBo
****
Q: HSsyZzZLZAAq, MFEZzZLJC

A: ZzZL
****
Q: bntwAPUyymVZAgDgBMsKdKOFr, nETLcCymVZAgDgBMkEBGAIfeIO

A:
ymVZAgDgBM
****