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

bUcuzFgsdfojVR, IdcuzFgsdMRgtMA
cuzFgsd

QRPOwtZATjDoJDdRNNSOH, wiafFMwpAjDoJDdRNNuCDZ
jDoJDdRNN

VmFXmomSk, tOXmogLk

Xmo