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

bSBuJiZniSlZtO, AcuJiZniSRAOAv
uJiZniS

dsngGP, KvnglB
ng

bTxvasrYXpXqiFDdimfXXZt, EvuuBpvTyvasrYXpXqiaOrbGBG

vasrYXpXqi