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

Q: RGImMTISYdkjzMO, pmyfpImMTISYdatLBBFr

A: ImMTISYd
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Q: ZhHtTXaUmsQfUMNrnt, KvvebSXaUmsQfBspwM

A: XaUmsQf
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Q: GBTHKtWUzK, ovVNKtWUmVJF

A:
KtWU
****