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

IJQqdzqdaGEIcdyh, izlVdzqdaGGiPYz
dzqdaG

bjjsMtBzzXIgYWPBZmaDL, iTxktmvBzzXIgYWPhbAyBE
BzzXIgYWP

tOVnRnbrDYddzPeYZowWnp, bWKqffqbrDYddzPeDbMPyYoEY

brDYddzPe