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

[Q]: iYuUgULgqcAgd, kRNUgULgqFv
[A]: UgULgq


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


[Q]: bKYCqVXUiTio, QAXCqVXUiTHiBa
[A]:
CqVXUiT