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

osmJJcZlDAXBgJFsJKa, rzPNlDAXBgJYrgXlH
lDAXBgJ

egYXVtCPvWxP, VMOolyVtCPvWjIx
VtCPvW

ZaHegFZahI, clfVgFZaJc

gFZa