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

AkYuNemHGBEDF, uluNemHGAycbWX
uNemHG

HqaOvLaZbs, RifOvLaZkh
OvLaZ

quOkBzCvBphcKVhgG, XtjfOEtUOkBzCvBphcLTJjyVwWJY

OkBzCvBphc