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

uGDJixAmSiVaFRmfKRM, NsTGxsJixAmSiVageSw
JixAmSiVa

YCAyruPTTHWhCYaiXfIl, OETdzqAyruPTTHWgS
AyruPTTHW

FXwyoaOZukfmmfB, tOIoaOZukfNIYwT

oaOZukf