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

cZSEmdgP, YsSEmEIM
SEm

QlJnxO, BLJnCQ
Jn

qUNSrZImlfAMObCch, foODSrZImlfAMODHbZdodOYT

SrZImlfAMO