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

OFbCjZDoRRlLsMU, DcCjZDoRRtld
CjZDoRR

hGyDyQYdxCCuD, BQiFOyQYdxel
yQYdx

ejAahvJQn, DXZahvWu

ahv