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

Q: PShMbsbexXGlpBuMMDZZS, sVqGxSexXGlpBxuHXoI

A: exXGlpB
****
Q: OVZxWYzAAxG, rStOxWYzJeoC

A: xWYz
****
Q: BuLGDUuXXbFHlP, vjYiLGDUuXXbFdGFVYD

A:
LGDUuXXbF
****