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

Q: ksRxEVrz, cOMRxEViwF

A: RxEV
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Q: MvALRGKkpALcKdhTtnm, neMkRGKkpALcKdcaxnXEPxW

A: RGKkpALcKd
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Q: eubYCSnmTMYKipks, JKPfrJGCSnmTMYKipipaYCDeK

A:
CSnmTMYKip
****