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

oZZUNCUHtIiauDxQ, OdindZUNCUHtIiLQmWJJf
ZUNCUHtIi

XqyPjqNZDEK, EfwPjqNgjIP
PjqN

ezVsFayUPcrte, lfsFayUMPTqx

sFayU