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

IzwlZDJSEFPxfIud, xwWSYwlZDJSEFPbvSXTlS
wlZDJSEFP

fWJdaAfOCfejXZvidHM, gOpfOCfejXZbtLvSLZI
fOCfejXZ

UFUYEUHWhTEO, AbfSEUHWhTwojL

EUHWhT