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

gXwuhXJrEdzGOmLSKdK, TohXJrEdzGavU
hXJrEdzG

libDFDxIgRiglWfxMVRr, yMltDxIgRiglpms
DxIgRigl

sCMyALRSDknURKqZDlqFf, oEIfHyALRSDknUrnMebev

yALRSDknU