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

[Q]: LeHzcEFc, WFzcExvJ
[A]: zcE


[Q]: LiiFMMLGfNHVnnga, beXMMLGfNHVsjdfdN
[A]: MMLGfNHV


[Q]: RydeXZOWrEsx, wUxZOWrETfLX
[A]:
ZOWrE