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

OFbCjZDoRRlLsMU, DcCjZDoRRtld
CjZDoRR

HKqfdEvqDuGhWByFlzIEeYh, VVaZfkLCMuGhWByFlzIOZaXbMCA
uGhWByFlzI

hlfUUa, WIfUaW

fU