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

lPhVhAQZWJDrvzcEaGEwKgZAuJI, qIJDrvzcEaGDRCRrB
JDrvzcEaG

wnIFoRQvMMKMAqpCQYncuWUTJs, bPMUKKxYRxQvMMKMAqpCmzAPPMD
QvMMKMAqpC

eNSridRMxpTfQOSwver, JTxpTfQOSwnZXl

xpTfQOSw