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

Q: EyvnjbVLF, vqnjblzR

A: njb
****
Q: dsngGP, KvnglB

A: ng
****
Q: ukVywEzJQN, GjwEzJlOY

A:
wEzJ
****