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

Q: pJqqIW, Ivqqxw

A: qq
****
Q: oZZUNCUHtIiauDxQ, OdindZUNCUHtIiLQmWJJf

A: ZUNCUHtIi
****
Q: FDUEKEwoozWHHNPoZFiD, HRoZZszaWcozWHHNPoZFhZmckvxDo

A:
ozWHHNPoZF
****