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

Q: YWNPkA, LuNPnN

A: NP
****
Q: yjoJzBGdwfOhsceoOpoap, uSLMdBGdwfOhsIQHBijd

A: BGdwfOhs
****
Q: vouBlv, TyuBNp

A:
uB
****