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

AedXEOrEgvnzF, TVTEOrEgvxKuJgv
EOrEgv

yRhCObvPZYoKUoQnyaatR, NHzLJYPZYoKUoQnJnIsZxC
PZYoKUoQn

pDdHgFXXZjd, jwkBgFXXZQfej

gFXXZ