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

FNVeaFmprNHqqtAaKv, iGBmrrMveaFmprNHqWWAvtht
eaFmprNHq

wcJmSloqlddFOfv, szhUIAqzSloqlddFDJz
SloqlddF

TCDbARwdFUHJIGFtlaVjXHz, BYLRwdFUHJIGzoESGZ

RwdFUHJIG