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

[Q]: TizkNtJUPHfhmGQ, enzehVkNtJUPHunpG
[A]: kNtJUPH


[Q]: aIZIsqL, wxSZIsEnO
[A]: ZIs


[Q]: JLIPjuVSxyKXYiYFhU, RIXSxyKXYiYFXcH
[A]:
SxyKXYiYF