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

uqazNuZhdJhw, KbnrzNuZhBdp
zNuZh

jFVaEHbMrrkW, ekfVaEHbPnBnM
VaEHb

zjHwVdtoVU, rVIwVdtHfax

wVdt