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

[Q]: UysTOtIRtRorNAFKKYD, icDOtIRtRoropYVaKzJ
[A]: OtIRtRor


[Q]: yRhCObvPZYoKUoQnyaatR, NHzLJYPZYoKUoQnJnIsZxC
[A]: PZYoKUoQn


[Q]: XmPuYdYKJ, qYzuYdYtW
[A]:
uYdY