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

[Q]: osmJJcZlDAXBgJFsJKa, rzPNlDAXBgJYrgXlH
[A]: lDAXBgJ


[Q]: vSFxjd, AHFxpi
[A]: Fx


[Q]: RpGvNpRosiqoFbgBU, GtRosiqomF
[A]:
Rosiqo