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

[Q]: NmtypJ, tQtyZD
[A]: ty


[Q]: yITbYie, TlqTbYomH
[A]: TbY


[Q]: IqTWDiKZojcTFLxgNJtkdS, boYacCAUZojcTFLxgfkHmGgQ
[A]:
ZojcTFLxg