In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
--------
Question: nFgMXUzpStDAybiwm, aNJrXUzpStDjp

Answer: XUzpStD


Question: SIIPePlrkftKkzfgdjg, JqNnXHrkftKkzOMUwmc

Answer: rkftKkz


Question: OFfNdeUXGfNCAi, HrPpUHeUXGfNCnJsNgJY

Answer:
eUXGfNC