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

SeXNqRAbKdLuWXgb, npsIWRAbKdLuUWSbvuS
RAbKdLu

VpJvIZdkzKovjc, BZEizZdkzKYZ
ZdkzK

UhjfEY, uEjfsv

jf