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

UQDJDbzqDxsMzUL, BxClJDbzqDxLxlngc
JDbzqDx

BmwpAnWJ, klVwpAFw
wpA

NlUfEHeaZPMWjNmKCuvXBHq, mSWPENPZPMWjNmKCleunaPC

ZPMWjNmKC