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

KvPFobZEGs, eKFobZEtnm
FobZE

skZGHS, HsZGge
ZG

cYqOGUhjJZqiTaTJkkeS, vbpwjJZqiTagPEwqN

jJZqiTa