In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
--------
Question: VXSNlHzkB, EoNlHCiL

Answer: NlH


Question: BmxgSFWBlVX, kGgKrgSFWBlGunFcZ

Answer: gSFWBl


Question: OkNQqOvucEshUbTz, vPZOvucEshUbvxLDdKIz

Answer:
OvucEshUb