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

bSBuJiZniSlZtO, AcuJiZniSRAOAv
uJiZniS

DwLGzwYOWjtzIunE, TTViSbkwYOWjtzNqUOOz
wYOWjtz

nBvrqt, jnvrFE

vr