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

Answer: JMpx


Question: LiiFMMLGfNHVnnga, beXMMLGfNHVsjdfdN

Answer: MMLGfNHV


Question: KkAqMCyfYv, ItAqMCbird

Answer:
AqMC