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

tftBHoDOYxCoTHVf, qhHoDOYxfUU
HoDOYx

rPPfxUdowLLdvwRtY, PuHovApkfxUdowLLBOhq
fxUdowLL

qixzPc, MzxzZH

xz