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

Q: BmxgSFWBlVX, kGgKrgSFWBlGunFcZ

A: gSFWBl
****
Q: LiiFMMLGfNHVnnga, beXMMLGfNHVsjdfdN

A: MMLGfNHV
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Q: IbbMHsFHWkCqRaa, rTMjHbMHsFHWPOkLvBt

A:
bMHsFHW
****