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

libDFDxIgRiglWfxMVRr, yMltDxIgRiglpms
DxIgRigl

cUCQXEFSgRZjK, RYdvUQXEFSgRZVlwx
QXEFSgRZ

mshcaNICFliEvAyyuPE, RxhcaNICFliZsThf

hcaNICFli