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

cZSEmdgP, YsSEmEIM
SEm

wbFDXJQDQxQJzudOUlR, QEbsIDXJQDQxQsSYIutwU
DXJQDQxQ

qApkhoxLjfZPTMUNlewnu, HdrLjfZPTMeErPh

LjfZPTM