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

[Q]: gfDDsblwUryUw, UWaRisblwUTqTM
[A]: sblwU


[Q]: sRpnJlgECTHh, JXfmNJlgECKyry
[A]: JlgEC


[Q]: zuiWRgLbbGXAEYuOsH, mVRtanAgLbbGXAIrZQWLk
[A]:
gLbbGXA