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

CMrTXnTnTVaR, srnXnTnTDNULO
XnTnT

OjQHcFUCflYUptUPqYKVomn, GXHcFUCflYUpSSTrQ
HcFUCflYUp

UGxVYGj, njxVYqO

xVY